Email deliverability is one of the most underestimated growth levers in B2B SaaS. You can craft the perfect outreach sequence, but if your emails land in spam folders, you're dead in the water. The difference between a 45% open rate and a 5% open rate often comes down to infrastructure, authentication, and the right tooling to monitor what's actually happening with your sends.
This guide reviews 15 deliverability tools that help founders and growth teams ensure their emails reach customer inboxes. We've evaluated solutions across email authentication (SPF, DKIM, DMARC), warm-up services, bounce monitoring, and inbox placement testing. Whether you're sending cold outreach, marketing campaigns, or transactional emails, you'll find detailed comparisons to help you choose the right solution for your infrastructure and budget.
In-depth analysis of each platform to help you make the right choice.
#1
HubSpot Sales Hub
Top Pick
Best For: B2B sales teams building a complete sales stack from scratch
HubSpot Sales Hub combines sales infrastructure with native deliverability monitoring, making it ideal for teams that need email tracking, authentication setup, and sequence management in one place. The platform guides you through SPF and DKIM configuration and provides real-time delivery and bounce feedback. For B2B teams already considering a sales operating system, the integrated approach eliminates tool sprawl and reduces onboarding complexity.
Pricing: Starts at $50/month for Professional tier; includes 1,000 email sends per month. Enterprise pricing available for teams needing advanced authentication and higher volume.
Key Features
Built-in email authentication setup (SPF/DKIM)
Bounce and delivery tracking
Email sequence builder with A/B testing
Real-time open and click tracking
Integrations with 1,000+ apps
Pros
+Guided setup for email authentication reduces configuration errors
+Native integration between sales sequences and deliverability data
+Responsive customer support helps troubleshoot delivery issues
+Clear dashboard shows bounce rates and sender reputation
+Scales easily as your outreach volume grows
Cons
-Pricing increases quickly with user count
-Authentication features are basic compared to dedicated email infrastructure tools
-Limited control over retry logic and sending schedules
-Requires HubSpot account even if you only need deliverability features
Verdict
HubSpot Sales Hub is the best all-in-one option for early-stage B2B teams. If you're already using HubSpot for CRM, the deliverability tools are solid enough for cold outreach and sales sequences. However, if you send extremely high volume or need granular control over email authentication, you may outgrow it quickly.
#2
Klaviyo
Best For: E-commerce and SaaS teams sending marketing campaigns and nurture sequences
Klaviyo specializes in email marketing with exceptional attention to deliverability. The platform includes a dedicated reputation monitoring dashboard, automatic list cleaning, and detailed authentication setup. Klaviyo's infrastructure is specifically optimized for merchants and SaaS teams sending marketing campaigns, making it particularly strong if you need high open rates on promotional emails or nurture sequences.
Pricing: Starts at $20/month for up to 500 contacts. Scales based on subscriber list size; 10,000 contacts costs around $75/month. No limits on send volume per pricing tier.
Key Features
Reputation monitoring with ISP feedback loops
List quality scoring and automatic list cleaning
DMARC/SPF/DKIM configuration wizard
Deliverability audit reports
Detailed bounce and unsubscribe analytics
Pros
+Strongest reputation monitoring dashboard of all tools reviewed
+Automatic list cleaning prevents spam complaints and hard bounces
+Excellent educational content on email deliverability best practices
+Fast customer support with email infrastructure expertise
-Pricing becomes expensive at scale (50k+ contacts)
-Focused on marketing emails; not ideal for cold outreach sequences
-Limited CRM features if you need account management
-Dashboard can feel overwhelming for beginners with many metrics
Verdict
Klaviyo is the top choice if email deliverability and list health are your primary concerns. The reputation monitoring tools catch problems before they tank your sender score. Best suited for marketing-focused teams; not recommended for teams doing primarily cold outreach.
#3
Zoho CRM
Best For: Bootstrap-stage B2B teams and early-stage startups with limited budget
Zoho CRM offers remarkable value for early-stage teams needing both CRM and email deliverability features. The $14/month entry price includes email validation, SPF/DKIM setup guidance, and bounce tracking. While not as feature-rich as premium platforms, Zoho's email infrastructure is reliable for B2B sales sequences. The platform integrates well with Gmail and provides straightforward authentication configuration for startups on tight budgets.
Pricing: Starts at just $14/month for single users; $23/month for team plans. Includes unlimited email sends and basic deliverability features across all tiers.
Key Features
Email validation and verification
SPF/DKIM/DMARC configuration support
Bounce and delivery reporting
Gmail integration with native email client
Unlimited email sends
Pros
+Lowest price point of any full-featured CRM
+Email deliverability features come standard, not gated behind expensive tiers
+Reliable infrastructure that doesn't flag as spam
+Good Gmail integration for teams using Google Workspace
+Straightforward customer support
Cons
-UI feels dated compared to newer competitors
-Email features are functional but not sophisticated
-Limited automation compared to HubSpot or Klaviyo
-Smaller partner ecosystem means fewer integrations
-Reputation monitoring dashboard is basic
Verdict
Zoho CRM is unbeatable for budget-conscious founders. If you're bootstrapped or pre-seed and need working email deliverability without premium pricing, Zoho delivers. The trade-off is you won't get enterprise-level features, but reliability is solid.
#4
Superhuman
Best For: High-volume B2B sales teams and outbound-focused SDRs
Superhuman focuses on email productivity for high-volume sales professionals and includes automatic email warmup—a critical feature for cold outreach at scale. The warmup process gradually increases your sending volume to establish a positive sender reputation before launching campaigns. Superhuman combines email client features with deliverability infrastructure, making it valuable for teams doing dozens of outreach emails daily.
Pricing: Starts at $30/month for individual users. Team plans available; enterprise pricing based on seat count and usage volume.
Key Features
Automatic email warmup with gradual volume increase
Real-time email open and link click tracking
Smart scheduling based on recipient engagement patterns
Inbox preview showing how emails appear in different clients
Integration with Salesforce and HubSpot
Pros
+Email warmup feature prevents new domains from being flagged as spam
+Exceptional email client speed and UI
+Accurate open tracking with better accuracy than most tools
+Smart scheduling automatically sends at optimal times
+Strong reputation among cold outreach professionals
Cons
-Premium pricing for what is essentially an email client with warmup
-Warmup feature requires sending many low-value test emails initially
-Limited CRM features; works best integrated with separate CRM
-Overkill for teams sending fewer than 100 emails daily
-Learning curve for maximizing deliverability features
Verdict
Superhuman is the best choice if you're doing high-volume cold outreach and need to warm up new sender addresses quickly. The warmup automation saves weeks of reputation building. Less relevant for marketing-focused teams or small operations.
#5
Streak
Best For: Gmail-native teams wanting lightweight CRM and email tracking
Streak transforms Gmail into a lightweight CRM with native email tracking and deliverability monitoring. Since it runs directly in Gmail, there's zero email sync friction, and deliverability feedback appears in real-time as you compose messages. For teams already committed to Google Workspace, Streak provides immediate visibility into email opens, clicks, and delivery status without requiring a third-party email provider.
Pricing: Starts at $15/month for individuals; team plans available at $40/month for 5 users. Free tier includes basic email tracking.
Key Features
Real-time email tracking in Gmail
Inbox placement alerts for deliverability issues
Gmail-native CRM pipeline management
Delivery status indicators for each email sent
Integration with email authentication via Gmail infrastructure
Pros
+Minimal setup required; works directly in Gmail interface
+Real-time delivery notifications alert you immediately to problems
+No email sync delays or data migration needed
+Inbox placement alerts help catch sender reputation drops early
+Lightweight and unobtrusive compared to standalone CRM systems
Cons
-Limited to Gmail users; won't work with Outlook or other email clients
-CRM features are basic compared to dedicated platforms
-No email warmup functionality
-Limited integrations outside Google Workspace ecosystem
Verdict
Streak is ideal if your team lives in Gmail and you want immediate visibility into email delivery without complexity. The inbox placement alerts are genuinely useful for catching problems early. Not suitable if you need advanced authentication control or use non-Gmail email clients.
#6
Copper
Best For: SMBs using Google Workspace as their email infrastructure
Copper is a Gmail-native CRM that brings sales operations directly into Google Workspace. The platform includes email authentication support and delivery tracking, all without requiring email migration. Copper's strength lies in its lightweight approach to sales infrastructure; it's ideal for SMBs that have standardized on Google Workspace and want CRM capabilities without heavy implementation.
Pricing: Starts at $25/month per user for Starter tier; $75/month for Professional. Includes email tracking and authentication support across all tiers.
Key Features
Gmail-native CRM without email migration
Email authentication support (SPF/DKIM)
Email tracking and delivery status
Activity timeline synced from Gmail
Integration with Google Calendar and Contacts
Pros
+Zero email migration friction since it uses native Gmail
+Straightforward email authentication setup
+Fast implementation; teams are productive immediately
+Reasonable pricing for SMB teams
+Email tracking is accurate and non-intrusive
Cons
-Limited to Gmail users
-Email features less sophisticated than dedicated email marketing tools
-No email warmup functionality
-Smaller ecosystem means fewer third-party integrations
-Limited automation compared to larger platforms
Verdict
Copper is a solid choice for Google Workspace-committed teams that need basic sales infrastructure without complexity. The email deliverability features are adequate but not sophisticated. Best for teams with fewer than 20 salespeople.
#7
Monday CRM
Best For: Process-heavy teams wanting visual workflow automation with email sequences
Monday CRM offers visual pipeline management combined with email reliability tools. The platform's strength is workflow automation, allowing you to create complex email sequences with conditional logic. Email deliverability is handled through standard infrastructure, and the platform provides bounce tracking and delivery reporting. Monday is best for teams that prioritize process automation over email-specific features.
Pricing: Starts at $39/month for Basic tier; $99/month for Pro. Email features included across all tiers; pricing scales with users and automation complexity.
Key Features
Visual pipeline management with email integration
Workflow automation for email sequences
Bounce tracking and delivery reporting
Custom fields for email metadata
Integrations with 50+ email and communication tools
+Visual interface helps teams understand sales process flow
+Strong integrations with email platforms
+Good customer support for troubleshooting
+Flexible pricing with unlimited email sends
Cons
-Email deliverability is basic; no advanced authentication features
-Not optimized for high-volume cold outreach
-Pricing increases significantly with team size
-Learning curve for complex workflow setup
-Overkill for teams that don't need heavy automation
Verdict
Monday CRM works well if your team needs visual process management and workflow automation. The email features are functional but not sophisticated. Not ideal if deliverability is your primary concern.
#8
HubSpot Sequences
Best For: HubSpot-committed sales teams doing structured outbound campaigns
HubSpot Sequences is a dedicated outbound tool that lives within HubSpot's ecosystem. It guides users through email authentication setup and provides clear feedback on delivery and bounce rates. The platform is excellent for teams already invested in HubSpot who want native sequence functionality without additional tools. DKIM/SPF setup guidance is particularly strong, reducing authentication errors.
Pricing: Starts at $50/month for Professional tier; $400/month for Enterprise. Includes Sequences functionality across most tiers.
Key Features
DKIM/SPF setup guidance within platform
Delivery and bounce tracking
A/B testing for subject lines and body copy
Follow-up automation based on recipient actions
Detailed reporting on sequence performance
Pros
+Seamless integration with HubSpot CRM reduces tool switching
+Clear DKIM/SPF setup guidance prevents common authentication errors
-Sequences features are less sophisticated than dedicated outbound platforms
-Pricing is expensive if you only want Sequences functionality
-Limited control over sending schedule and retry logic
-Email warmup not available
Verdict
HubSpot Sequences is best if you're already using HubSpot Professional or Enterprise. The authentication guidance is valuable, and integration is seamless. Not worth adopting if HubSpot isn't already your primary platform.
#9
Salesforce Essentials
Best For: Enterprise teams and compliance-heavy organizations
Salesforce Essentials provides enterprise-grade email security protocols and authentication features. The platform is built for compliance-heavy organizations that need detailed email logs and advanced security controls. While expensive for early-stage teams, Salesforce offers unmatched email infrastructure reliability and audit trail capabilities for regulated industries.
Pricing: Starts at $165/month per user; no startup-friendly pricing available. Enterprise pricing requires custom quote.
Key Features
Advanced email security protocols
Detailed email audit logs for compliance
Enterprise-grade authentication controls
Multi-factor authentication for email accounts
SLA-backed uptime guarantees
Pros
+Enterprise-grade security and compliance features
+Detailed audit logs for regulatory requirements
+Exceptional uptime and reliability
+Dedicated account management
+Advanced authentication controls
Cons
-Prohibitively expensive for early-stage teams
-Overkill for basic deliverability needs
-Steep learning curve; requires implementation support
-Pricing per user makes scaling expensive
-Not ideal if you need modern UX and ease of use
Verdict
Salesforce Essentials is only worth considering if you're a large enterprise with specific compliance requirements. The cost and complexity make it unsuitable for most B2B startups.
#10
Nimble
Best For: Social selling teams wanting unified social and email management
Nimble is a social CRM that brings email deliverability into a social-first context. The platform includes email authentication verification and basic deliverability features. Nimble is strongest for teams that prioritize social selling alongside email outreach and need a unified social and email presence.
Pricing: Starts at $19/month for individuals; $99/month for team plans with 5 users.
Key Features
Email authentication verification
Social media integration with email
Contact enrichment from social profiles
Email tracking and delivery status
Social engagement tracking
Pros
+Affordable pricing for small teams
+Unique focus on social selling alongside email
+Good contact enrichment from social platforms
+Email features integrated with social data
+Fast implementation
Cons
-Email deliverability features are basic
-Small partner ecosystem limits integrations
-Customer support can be slow
-CRM features less sophisticated than dedicated platforms
-Limited automation capabilities
Verdict
Nimble works if your team emphasizes social selling. The email deliverability features are adequate but not sophisticated. Not recommended if email is your primary channel.
#11
Verifone CRM
Best For: Payment-processing-heavy businesses needing compliance-focused email
Verifone CRM integrates payment processing with CRM and email management. The platform is compliance-focused, making it valuable for payment-heavy workflows. Email deliverability features emphasize regulatory compliance and secure communication. Verifone is niche but strong for industries that combine sales with payment processing.
Pricing: Contact sales for custom pricing; no published starter plan available.
Key Features
Payment-integrated email workflows
Compliance-focused email handling
Secure communication protocols
Email authentication verification
Integration with payment processors
Pros
+Unique focus on payment processing integration
+Strong compliance and security features
+Dedicated support for payment workflows
+Email security is top-tier
+Good for regulated industries
Cons
-No published pricing; opaque pricing process
-Overkill if you don't need payment integration
-Smaller user base means less community support
-Longer implementation timeline
-Limited email-specific features
Verdict
Only consider Verifone if you're a payment processor or payment-heavy platform that needs compliance-focused email. For most B2B SaaS teams, it's over-engineered and unnecessarily expensive.
#12
Aircall
Best For: Sales teams using phone + email as primary communication channels
Aircall is a phone-first communication platform that includes email capabilities and delivery tracking. The platform is strongest for teams that blend phone and email communication and need unified reporting across channels. Email deliverability features are adequate but secondary to Aircall's phone functionality.
Pricing: Starts at $30/month for individuals; scales based on team size and usage.
Key Features
Multi-channel deliverability insights
Phone and email unified reporting
Call recording with email context
Delivery tracking across channels
Integration with major CRMs
Pros
+Unified reporting across phone and email
+Call recording helps with training and quality
+Good multi-channel integration
+Reasonable pricing for phone + email
+Decent customer support
Cons
-Email deliverability is not the focus
-Phone features overshadow email capabilities
-Limited email-specific configuration options
-Not ideal if email is your primary channel
-Smaller email user base means less email expertise
Verdict
Aircall is worth considering if your team equally prioritizes phone and email. The unified reporting is helpful. Not recommended if email is your primary sales channel.
#13
Notion CRM
Best For: Highly customization-focused teams building bespoke sales processes
Notion CRM is a lightweight, customizable database that allows teams to build CRM-like systems without constraints. Email deliverability features are minimal; Notion relies on integrations with third-party email tools. This approach works for teams that need flexibility and are comfortable manually configuring workflows, but it's not ideal if you need built-in email infrastructure.
Pricing: Free for individuals with limited features; $10-20/month for teams wanting advanced database features.
Key Features
Fully customizable database structure
Manual authentication configuration
Integration with email platforms
Basic email metadata tracking
No constraints on customization
Pros
+Extremely affordable or free
+Unlimited customization options
+No vendor lock-in; data is portable
+Great for teams with unique workflows
+Lightweight and fast
Cons
-Email deliverability features are essentially non-existent
-Requires manual integration with email tools
-Heavy lifting required to set up authentication
-Limited automation capabilities
-Not ideal for teams without technical skills
Verdict
Notion CRM is only suitable if you're comfortable manually configuring email integrations and your primary need is process tracking rather than email deliverability. Not recommended for most B2B sales teams.
#14
Slack Sales Elevate
Best For: Slack-native teams wanting sales features within their communication hub
Slack Sales Elevate brings sales features directly into Slack, including email tracking and delivery notifications. The platform is ideal for teams already living in Slack who want sales functionality without context switching. Email deliverability features are basic but useful for teams that prioritize real-time delivery alerts within Slack.
Pricing: Starts at $25/month for individuals; team pricing available based on seat count.
Key Features
Email tracking in Slack
Real-time delivery notifications
Slack-native sequence management
Opportunity tracking within Slack
Slack bot for email commands
Pros
+Eliminates context switching for Slack-heavy teams
+Real-time delivery alerts directly in Slack
+Fast implementation; uses existing Slack setup
+Good if your team is already Slack-dependent
+Reasonable pricing
Cons
-Email deliverability features are basic
-Not suitable for teams not using Slack
-Limited email configuration options
-Weak if email is your primary sales channel
-Smaller feature set than dedicated platforms
Verdict
Slack Sales Elevate works if your team lives in Slack and wants to avoid tab switching. Email deliverability features are adequate but basic. Not recommended as your primary sales infrastructure.
#15
HubSpot Operations Hub
Best For: Larger teams managing email compliance and operations at scale
HubSpot Operations Hub is designed for infrastructure management, including email compliance workflows and automation. The platform brings together email compliance, data management, and process automation. It's valuable for larger teams that need centralized compliance management and automated email operations across the organization.
Pricing: Starts at $75/month; scales based on usage and team size. Requires additional HubSpot licensing.
Key Features
Automated email compliance workflows
Data management and cleaning
Process automation for email operations
Audit logs for compliance tracking
Integration with HubSpot ecosystem
Pros
+Comprehensive compliance automation reduces manual work
+Centralized email operations management
+Strong audit logs for regulatory requirements
+Scales well as organization grows
+Tight integration with HubSpot platform
Cons
-Expensive for small teams
-Requires HubSpot ecosystem to justify cost
-Overkill if you don't need compliance automation
-Complex setup requires technical resources
-Not suitable for early-stage startups
Verdict
HubSpot Operations Hub is only worth considering if you're an established HubSpot customer with specific compliance automation needs. Early-stage teams should skip this tier.
Frequently Asked Questions about deliverability tools
Email deliverability tools focus specifically on ensuring your emails reach inboxes rather than spam folders. They typically handle authentication (SPF, DKIM, DMARC), sender reputation monitoring, bounce tracking, and inbox placement testing. Email marketing tools like Klaviyo or Mailchimp include deliverability features but emphasize campaign design, segmentation, and analytics. Deliverability tools are essential infrastructure; marketing tools are for campaign execution. Most B2B teams need both: a deliverability platform for cold outreach and a marketing platform for nurture campaigns. The best deliverability tools integrate authentication setup, bounce classification, and reputation monitoring into a clear dashboard.
Yes, absolutely. SPF, DKIM, and DMARC are email authentication protocols that verify you own the sending domain. Without proper setup, ISPs flag your emails as potential spam. SPF tells mail servers which servers are authorized to send email from your domain. DKIM adds a cryptographic signature proving the email came from you. DMARC creates a policy telling ISPs what to do if authentication fails. Most modern deliverability tools provide setup wizards that make this straightforward, typically taking 15-30 minutes. If you're sending from a Gmail or Microsoft account, some authentication is automatic, but custom domain outreach requires manual setup. Poor authentication is one of the top reasons cold outreach emails land in spam, so this step is non-negotiable.
Several tools can test inbox placement. Tools like Superhuman and Klaviyo include inbox preview features showing how your email appears in different clients. Many platforms offer free seed list testing where you send emails to test addresses monitored by ISPs. Check your bounce reports—if you see many soft bounces or 'mailbox full' responses, it suggests potential spam folder delivery. Monitor your sender reputation score through tools like Zoho or HubSpot; scores below 75/100 indicate problems. Also manually check email accounts at major ISPs (Gmail, Outlook, Yahoo) to see if your emails arrive in the inbox or spam folder. Most importantly, ask recipients if they see your emails. If open rates drop suddenly without obvious reason, spam delivery is likely the culprit.
Email warmup gradually increases sending volume from a new domain to establish a positive sender reputation. When you first start sending from a domain, ISPs have no history of it. To prevent abuse, they treat new domains with suspicion. Warmup services (like Superhuman) send low-volume test emails initially, then gradually increase volume. This proves to ISPs you're a legitimate sender. Warmup typically takes 2-4 weeks before you can send high-volume campaigns. If you skip warmup and immediately send 1,000 cold emails from a new domain, ISPs will flag you as spam. For teams buying aged domains or sending from established addresses, warmup is less critical. For new domains or accounts, it's essential. The better deliverability tools include automation to manage warmup, reducing manual effort.
Conclusion
Choosing the right deliverability tool depends on your team's current infrastructure and email volume. For all-in-one teams wanting CRM plus deliverability, HubSpot Sales Hub and Klaviyo are industry-leading options with strong authentication guidance and delivery monitoring. Budget-conscious founders will appreciate Zoho CRM's remarkable value. If you're doing high-volume cold outreach, Superhuman's email warmup is genuinely valuable. For Gmail-native teams, Streak and Copper eliminate sync friction and provide native tracking.
The most important deliverability fundamentals—proper SPF/DKIM/DMARC setup, bounce monitoring, and sender reputation tracking—are now table stakes in most platforms. The differentiators are user experience, integration breadth, and whether the tool provides guidance or just raw data. Most early-stage B2B teams are better served by a platform that actively guides authentication setup rather than tools that require technical expertise.
Implementation timing matters too. If you're starting cold outreach, fix authentication before you send volume. If you're scaling campaigns, monitor bounce rates and sender reputation weekly. Consider pairing your primary platform with a secondary tool for specific needs—for example, using Klaviyo for marketing campaigns while using HubSpot Sequences for sales sequences. RevAlign.io can help you map your email infrastructure, audit deliverability configuration, and optimize sender reputation across your tech stack. Start with authentication and monitoring, then layer in warmup and automation as your volume increases.
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