October 28, 2023

The Top 10 Email Deliverability Tools: Features, Prices

Explore the top 10 email deliverability tools to try, including their features, pros and cons, and prices. Also, discover answers to some common FAQs.

The Top 10 Email Deliverability Tools: Features, Prices

Email deliverability tools ensure your emails reach the recipient's priority inbox and don’t bounce back. 

Such tools can help improve sender reputation, deliver insights on spam reports, and determine the success of your outreach campaigns.

But what's the best tool for your email deliverability needs?

In this article, we’ll list the top ten email deliverability tools, including their features, pricing, and pros and cons. We’ll also answer three common questions you might have about these tools.

Let’s get started.

10 Top-Notch Email Deliverability Tools to Try in 2023

Here are the 10 best tools you can deploy to boost your email deliverability: 

1. Allegrow

Allegrow is an email deliverability platform that uses technology to enhance your sender reputation, boost email deliverability, and improve inbox placement. It ensures that all your emails reach the prospect’s primary inbox and don’t wind up in spam.


  • Integrate directly with sales engagement platforms like, Salesloft, and CloseCRM.
  • Conduct hourly checks to verify your SPF, DKIM, and DMARC protocols function optimally. 
  • Identify risky contacts or bad data in your outgoing email messages to avoid the spam traps of an email service provider. This isn’t just avoiding invalid contacts, it’s also helping you stay clear of  B2B prospects that react badly to cold email prospecting (who are either likely to report or ignore you). 

  • Establish a unique knowledge base pertaining to your industry and unique value proposition.

  • Use A/B testing and AI content drafting to find the best version of your email content with optimal length to bypass spam filters. 

  • Compare the real-time spam rates of users on your leaderboard and fix issues without undermining your sender reputation.

  • Connect to major B2B email providers like Google Workspace, Office 365 and custom on-premise email servers to gather spam rate data.

  • Gain valuable insights on the type of content type being reported by spam filters with Allegrow’s analysis of thousands of spam folders.

  • Show prospects your emails' value and engagement potential using Allegrow’s automated simulated interactions.

  • Track your email interactions and their performance with Allegrow’s trustworthy network of 2,500 business email addresses.

  • Obtain regular updates regarding your sender reputation and determine how frequently your messages end up in recipients’ spam or junk folders. 


  • Allegrow is specialized for outbound email deliverability. (Most tools are for newsletter-style marketing, but outbound email has very different requirements).
  • Gathers data from real B2B inboxes on where your emails are landing. (unrivaled accuracy). 
  • Integrates to the major sales engagement platforms like Salesloft and Outreach (which stops emails that hurt your sender reputation from being sent). 


  • No free version of the solution. (but, you can get a free audit to benchmark your deliverability against your peers). 
  • No package for teams with only 1 email user/seller. 
  • One of the more expensive options. 


Allegrow offers three pricing options based on the size of your team and volume of outreach:

  • Audit - 100% free. We’ll analyze your current deliverability against industry benchmarks for free. 
  • Premium - The best plan for go-to-market teams of up to 10 people.
  • Scale Plus - The most comprehensive solution for teams of more than 25 sellers.

Prices are available on request. 

2. Google Postmaster Tool

Google Postmaster Tool is an email deliverability platform that analyzes your email performance and aids Gmail in routing your messages to the primary inbox.


  • Monitor your spam reports and feedback loop with Google Postmaster Tool’s comprehensive dashboard.
  • Track the number of your emails that passed SPF, DKIM, and DMARC authentication compared to all outbound messages. 
  • Identify the percentage of encrypted inbound and outbound emails.
  • Analyze your domain reputation with the domain rating feature (bad, low, medium, or high).


  • As Postmaster and Gmail are Google-owned, you can access data from one of the world’s largest email providers.
  • Postmaster Tools has a single dashboard providing you with email deliverability insights. 


  • Limited capabilities compared to other paid tools
  • Google Postmaster tools only track data when you are manually reported as spam. Unfortunately, most deliverability issues are caused by automatically landing in spam, and Google won’t share this data through Postmaster tools. 
  • The tool only shows data on Gmail users, so if you prospect commercial Microsoft users the data won’t be relevant. 


Google Postmaster is a free email deliverability tool.

3. MailTester

MailTester is a cloud-based email verification tool that helps you validate the domains and syntax of your emails.


  • Check whether domains you are reaching out to actually exist.
  • Identify spelling mistakes in emails from form fills.
  • One-time tests for DKIM, SPF and DMARC.
  • Integrates with newsletter applications for inbound email marketing, like Mailchimp, Sendgrid and Active Campaign.


  • Affordability
  • Ease of use
  • Great for newsletters


  • Bulk email checking might not be efficient enough. If you use a high-quality contact data provider these checks will have already been run in most cases.
  • Not specialized for outbound deliverability. (No sales engagement integrations or risk analysis for cold email).


  • Growth (500 email searches): $39/month
  • Growth (1,000 email searches): $79/month
  • Pro: $199/month
  • Business: $299/month

4. Sender Score

Sender Score (Return Path) is an email deliverability software that helps you assess the success of your email campaigns and inbox placement rates.


  • Analyze metrics like bounce rate, and open and click-through rates
  • The Subject Line Previewer will show you how your subject appears in different inbox providers.
  • Look up the health of your IP reputation. However, if you're using Google Workspace or Microsoft 365 this won't be key to determining inbox placement. 
  • Upload your subscriber list and check if the domains you are reaching out to exist, with a breakdown of your email providers on your list. 


  • One of the best tools if you send through an application designed to contact subscribers 
  • Support from an online specialist to help you handle challenging situations


  • The email verification service can be improved – uses verification which doesn't analyze common spam reporters or people who don't engage with cold email.
  • Inbox delivery data based on the seed list instead of the B2B inboxes across unique postmasters.
  • No integrations to sales engagement platforms like Salesloft, Outreach or Close CRM.


Sender Score offers custom pricing plans based on potential customers' requirements.

5. GlockApps

The GlockApps platform offers multiple deliverability tools to identify your inbox placement rate issues based on manual tests users run and send to Glock Apps seed accounts.


  • Check your email content for ‘spam triggers’ using Glockapps email spam tests.
  • Boost email deliverability by checking if your emails pass the DKIM and sender policy framework authentication.
  • Monitoring the reputation of your IP address.
  • Run your email through Glockapps Spam Filter Score Check to see if you pass common spam filters.
  • Create multiple email-sending accounts with different SMTP settings and run automatic email spam tests to determine deliverability issues.


  • Provides detailed reports for different email providers with their test emails
  • Detailed spam report and blacklist monitoring


  • Difficulty in bypassing corporate firewalls
  • Does not use real B2B inboxes to get placement data. (many believe will lead to less accurate tests). 
  • Static tests - meaning you can do a ‘one-off’ test of specific email content, but not see trends of your deliverability changing every day. (this means you can easily miss declines in reputation) 


  • Personal: Free
  • Basic: $85 per month
  • Growth: $142 per month
  • Enterprise: $185 per month

6. MxToolbox

MxToolbox is an email deliverability tool offering free blacklist, DNS and email tools, and paid email delivery solutions.   


  • Check your blacklist status with MxToolbox’s blacklist checker.
  • The DMARC Record Lookup / DMARC Check is a diagnostic tool that checks the DMARC Record for your domain name and informs you of any issues with the record. 
  • The Email Health Check executes several domain or email performance tests to ensure all your online systems perform optimally and alert you of problem areas. 
  • Make your email subject lines readable and free of spam triggers.


  • The DNS analysis tool and email authentication monitoring service help with maintaining a robust email infrastructure
  • Walkthroughs available for every feature of the platform
  • Easy to use free offerings. 


  • Data from blocklists aren’t used by major ISPs to make filtering decisions.
  • Has no functionality for testing inbox placement, warming up inboxes, preventing spammy content and invalid email sends inside cold email platforms.


MxToolbox has a free plan and two paid options:

  • Delivery Centre: $129/month
  • Delivery Centre Plus: $399/month

7. Folderly

Folderly, supported by Belkins (an outsourcing agency), is an email deliverability tool used for spam testing and monitoring email deliverability to help address any spam issues. 


  • Conduct a free domain health checkup and quickly obtain your deliverability score.
  • Generate a functioning SPF record.
  • Create a valid DMARC record.


  • Good resources for creating SPF, DKIM and DMARC records. (if you’re an SMB and haven’t set these up). 
  • Offers warm-up functionality. 
  • Integrates to 3rd party SMTP services like (Sendgrid, Intercom and Mailgun). 


  • Does not get data from B2B inboxes with unique postmasters (instead, Folderly sends emails to mailboxes their team have set-up for testing).  
  • Not specialised for cold email systems. (more for marketing through 3rd party SMTPs).
  • Doesn’t prevent sending to bad/risky email addresses. 


Folderly has two email deliverability services at different price points:

  • Cold email for outbound campaigns: $200/month
  • Email marketing for warm customer engagement: Custom quote

8. Mailwarm

Mailwarm is an email warmup tool that works by providing responses to automatic emails from a network of ‘@gmail’ inboxes they’ve set up. 


  • Connect mailboxes for warm-up in 2 minutes. 
  • Adjust the number of warm up emails you’d like to receive.  
  • Supports inbox connection from most major email providers. 
  • Provides live chat and email support. 


  • Easy to connect to. 
  • Good for small teams just starting to understand warm-up. 


  • Uses ‘@gmail’ accounts to provide responses. 
  • Does not provide a sender reputation score. 
  • Does not have anyway of stopping you sending emails to bad contacts. 


  • Starter: $79 per month up to one account to warm up
  • Growth: $189 per month up to three accounts to warm up
  • Scale: $549 per month up to 10 accounts to warm up

9. Mailtrap

Mailtrap is an email deliverability platform that helps individuals and businesses send, control, and test emails and related processes in one place through their SMTP servers. 


  • Lets developers test automated transactional emails from your dev environment using their API. 
  • Validate HTML and CSS in your marketing emails. 
  • Record and analyze delivery statistics like (bounce, open and click rates). 
  • Secure a dedicated IP address for high volume transactional email sends. 


  • Developer friendly
  • Smooth integration with other software
  • Specialised for newsletter / transactional style emails. 


  • Cannot not run placement tests to real inboxes. 
  • Not ideal for a cold email use-case (more suited for opt-in marketing). 
  • No email validation system. 


Besides the free plan, Mailtrap offers five more pricing plans:

  • Individual: $14.99/month
  • Team: $34.99/month
  • Business: $64.99/month
  • Premium: $129.99/month
  • Enterprise: $399.99/month

10. is a CRM platform that provides efficient cold outreach and contact management services.



  • Track and monitor your warm-up campaign on’s dashboard with insights about inbox placement and warm-up progress.
  • Craft follow-up messages with an AI assistant.
  • Search for contact data and prospects using their email finder. 


  • An all-in one solution which could help smaller teams. 
  • Ready to use email templates
  • Offers a managed service if you’d prefer to outsource prospecting. 


  • Provides warm up only for Office 365 mailboxes
  • Does not provide inbox placement data
  • No integration to an existing sales engagement platform, like Salesloft, Outreach or Close CRM
  • Email contact data provided has higher bounce rates reported compared to alternatives like SalesIntel, Goodfit and Rightbound. 
  • No analysis of content quality/spam rating. 


Besides the free trial option, provides three other paid plans:

  • Starter: $39/month
  • Pro: $99/month
  • Managed Service: $2,999/month

Now that you have a list of handy tools to boost your email deliverability, let’s answer the questions you might still have about these tools.

3 FAQs about Email Deliverability Tools

Here are the answers to some common questions you may have about email deliverability tools:

1. Why Do You Need an Email Deliverability Tool?

An email deliverability tool is essential to smoothly execute your email marketing campaign and follow-ups, ensuring they land in the prospect’s primary inbox. It helps you:

  • Avoid Spam Filters: The email deliverability tool conducts content analysis, email validation, and warmup so that your emails don’t get caught in the spam filter.

  • Improve Sender Reputation: The tool provides you with key metrics regarding your email sending patterns, such as insights about bounce rates and spam rate. Such data helps you undertake measures to boost your sender reputation. 

  • Monitor Inbox Placement: With an email deliverability tool, you can see how often your email traffic is landing in spam folders rather than the primary inbox, and avoid high-risk contacts which would harm your inbox placement. 

2. What Are the Essential Features of an Email Deliverability Tool?

Here are some essential features needed in a good email deliverability tool:

  • Integrations to your sending platform: An email deliverability tool needs to connect to the systems you use to send emails to be effective. Otherwise, they won’t be able to build quality data or proactively resolve sending issues. This typically means either Google Workspace or O365 integrations for a general corporate use-case. Or / Salesloft integrations for an outbound prospecting use-case with larger companies.  

  • Spam Rate Monitoring: There are two types of spam rate to be aware of (i) Spam complaints rate and (ii) The rate at which your emails automatically land in the spam folder. Specific tools will let you track either of these different rates using different data sources. 

  • DMARC, SPF and DKIM Analytics: Deliverability tools can help you configure and manage your DMARC, SPF and DKIM policies, specifying the action to be taken when an email fails one fo these checks. 

  • A/B Testing Email Content: You can improve email deliverability by testing which version of your email content engages more prospects. With its A/B email testing capability, an email deliverability tool helps you pick the best variation for landing in the primary inbox and driving engagement.

  • Network of inboxes: The inbox network any deliverability tool uses to get their data will dictate the quality of the tools' core functionality. It’s important to note if a tool uses either real B2B inboxes or seed mailboxes. 

  • Domain Warm Up: Many deliverability tools help with domain warm up via interactive mailboxes. This ensures that you don’t end up in a spam folder or have negative interactions, helping you build your domain reputation and improve deliverability.

  • Inbox Placement Data: Inbox placement rate helps you determine how successfully your emails land. Deliverability tools analyze how many of your emails land in spam folders and primary inboxes to ensure you maintain good deliverability scores. 

  • Contact Risk Analysis and Validation: The best email deliverability tool will offer features that stop you from mailing prospects who report spam emails, are likely to bounce or don’t usually engage with outbound emails. This will help you maintain a positive domain reputation.

3. What Are the Different Types of Email Deliverability Tools?

There are a variety of email deliverability tools available in the market:

  • Inbox Placement Tool: This tool lets you know the percentage of your email traffic which will land in the primary inbox rather than the spam folder on average and track how this changes over time. The platform should let you measure this for (i) Different Domains, (ii) Different Email Inboxes and (iii) Different variations of Content. 

  • Email Verification Tool: An email verification tool helps you remove invalid emails from your sending flow and ensures you don’t reach out to contacts that report emails as spam or rarely engage with them. 

  • Email Warm-Up Tool: This provides positive interactions to help build your sender reputation. This means your mailbox receives replies, is categorized as important and is marked as ‘not spam’ automatically inside a receiver inbox network. 

However, it might be challenging to use a separate tool for each of these different functions. A better alternative is to switch to a specialized platform that lets you track where your emails are landing, ensures you don’t reach out to risky contacts and warms up all your sending inboxes. 

Deploy Allegrow for All Your Email Deliverability Needs

Email deliverability is essential for the success of your outreach campaigns. 

While it may be tricky to get everything right on your own, an email deliverability tool can help you identify problem areas, reduce bounces and increase prospecting engagement for a sustainable outreach process. 

And if you’re looking for an email deliverability tool that is specialized for cold outreach, look no further than Allegrow.

Sign up for Allegrow today and have peace of mind that you’re ticking every single email deliverability box.