Top 7 Email Deliverability Tools in 2025

A poor email deliverability is a silent killer for any cold outreach campaign. It prevents your cold emails from getting into your prospect’s inbox, wasting their efforts and rendering the entire campaign unyielding. 

However, with some email deliverability tools, you can avoid this situation and ensure your cold emails land in your prospect’s inbox. With their automation capabilities, they save time and optimize your sending reputation. In this article, you will learn what email deliverability is and the top 7 email deliverability tools to enhance your cold campaigns for 2025. 

What’s Email Deliverability?

Email deliverability refers to the ability of an email to land in a recipient's inbox successfully, not the spam or other folders. It’s a process that ensures your messages aren’t spammed or blocked by internet service providers.  

Many sales teams leverage email deliverability tools to ensure their messages reach their prospects and drive the intended results. In the next section, we will look at some benefits of email deliverability. 

Benefits of Email Deliverability

Good email deliverability offers various benefits, especially to sales teams who rely on cold emails to generate qualified leads and drive revenue. Here are some of its key advantages:

Increased Reach and Visibility

One of the biggest nightmares of any salesperson is having their cold emails land in the spam folder. If this becomes prolonged, all their outreach efforts become a waste, resulting in a failed campaign. 

However, email deliverability ensures cold emails land in your lead’s inboxes rather than the spam folder. This increases the likelihood of your prospects seeing your messages, enabling you to build relationships with them.  

Optimizes the Sender's Reputation 

A strong sender reputation is akin to a credit score for email. When your emails scale through reputation checks such as spam and content filters, you prove to the service providers that your domain is credible, thus winning their trust. 

Plus, your recipient’s engagement rate indicates they find your emails valuable and relevant. These factors reduce the likelihood of getting blacklisted by these email service providers and optimize the sender's reputation. A strong sender reputation enhances deliverability, ensuring future emails reach the inbox instead of the spam folder.

Increased Conversion 

Email deliverability ensures cold emails reach your prospect’s inbox, increasing their chances of seeing your messages. If this continues and they find your content resonating, that could increase conversions. In short, good email deliverability ensures that more of your audience receives your business offerings through valuable content, increasing the chances of converting your audiences. 

Top 7 Email Deliverability Tools 

In this section, we will discuss the top 7 email deliverability tools that can ensure your cold emails reach your prospect’s inbox. 

1. Instantly 

Instantly is a sales engagement platform that offers email deliverability features for its users.  With a one-click activation system, you can connect multiple email accounts to Instantly and activate the deliverability booster to keep your cold emails out of spam. Then, it slowly warms up your account by gradually increasing the email volume over time to maintain a healthy sender reputation. Also, Instantly features a deliverability dashboard that monitors your cold email’s activities. It offers deliverability metrics, enabling you to determine whether your emails landed in spam or the inbox. This helps you gauge your performance and identify areas of improvement. 

‍Pricing

‍Instantly’s pricing starts from $30 per month. 

2. Smartlead 

‍Smartlead’s email deliverability feature helps to build your sales pipeline and ensure your cold emails land in your prospect’s inboxes. With a few clicks, you can connect to multiple email accounts which auto-rotate your email messages. This process humanizes the sending patterns and uses smart replies to enhance your credibility with the email service providers (ESPs)Besides, its AI warm-up sends the emails gradually to gain the ESP’s trust and prevent your emails from going to spam. This approach, combined with real-time analytics and dynamic ESP matching, boosts inbox placement rates, allowing your prospects to respond to cold emails. Smartlead integrates with third-party platforms like Slack, Gmail, HubSpot, Zapier, and more. 

‍Pricing

‍Smartlead offers 14 days free trial. Its paid plans start at $39 per month.

3. Lemlist 

‍Lemlist is a sales automation tool that ensures your emails reach inboxes and get replies. Its email warmup and deliverability booster, Lemwarm, implements a two-pronged approach to ensuring your cold emails make it to your prospect’s inbox, not the spam folder. First, it warms up your email accounts by sending a high volume of emails gradually to a large network of 10,000 users. The warm-up phase, which takes place for about 3-4 weeks,  humanizes the sending approach to prevent your email domain from getting blacklisted and increasing its credibility by email service providers. 

Next, Lemwarm monitors your sending volume and provides a deliverability score for your cold email campaigns. You receive notification alerts to monitor your sending volume or potential spam triggers. These alerts help gauge your email performance, enabling you to determine whether it got into the prospect’s inbox. Lemlist integrates with third-party platforms like CRMs, data enrichment tools, automation workflows, and more. 

‍Pricing

‍Lemlist offers a 14-day free trial. Paid plans start at $69 per month. 

4. Unify 

Next on the list is Unify. Primarily designed as an intent signal tool, Unify also manages email deliverability to ensure your emails end in the prospect’s inbox. Its modern email infrastructure allows users to set up domains easily and maintain their sending reputation. Here, you can set smart sending limits and auto-rotate with multiple email accounts to protect your domain’s credibility with the email service providers. 

The email deliverability tool also simplifies the management of mailboxes to ensure a smooth email warmup and high deliverability. You can easily set up the secondary forwarding feature to manage all replies effortlessly. Additionally, Unify checks for potential bounces before an email is sent to ensure it gets into the inbox, not spam. It doesn’t send any email once it suspects it could bounce. The email deliverability tool integrates with various platforms like Salesforce, HubSpot, Slack, Zapier, and 6Sense.

‍Pricing

‍Unify’s plan starts from $1,000 per month. 

5. Folderly

Unlike other platforms that offer other services, Folderly primarily focuses on email deliverability. The tool addresses deliverability with a three-pronged approach. First, it checks your email infrastructure including IP addresses and DNS records — MX, SPF, DKIM, and DMARC – to check your domain health. Next, its inbox placement feature ensures your emails land in the inbox, not the spam folder. Coupled with its email spam checker, Folderly reviews your email content and provides daily alerts on spam-triggering words so you can remove them and increase your email campaign’s effectiveness. 

This eliminates the need for manual review and increases the likelihood of your emails reaching the inbox.Folderly also detects and addresses deliverability issues that you may encounter. Its user-friendly interface showcases what’s working and provides recommendations to solve diagnosed issues. The platform integrates with various ESPs such as Gmail, Outlook, SendPulse, Yahoo, Sparkpost, Mailgun, and more. 

‍Pricing

‍Folderly’s flexible pricing plan starts at $96 monthly for 1-9 mailboxes.

6. Zero bounce 

Originally designed as an email validation platform, Zerobounce also has an email deliverability feature to ensure deliverability for high-volume emails. Its deliverability has various toolkits to make your emails enter the prospect’s inbox. These toolkits include: 

• DMARC Monitor: This toolkit simplifies email authentication, protecting your domain from unauthorized use and security attacks. With a DMARC monitor, you can monitor multiple email domains, get detailed reporting for every email sent, and receive alerts for suspicious activities. 

• Blacklist Monitor: The blacklist monitor scans your email every 24 hours to provide alerts for potential blacklists for your domains. 

• Inbox Placement Test: This provides test email addresses of over 20 email service providers to test your email campaigns and ensure they get into the inbox. 

• Email Server Tester: This runs diagnosis checks for your email domain to identify and fix potential issues. It includes DNS records checks, RFC-based testing, DMARC analysis, alignment checks, and more.

• Email Finder: This helps you to find your prospect’s valid email addresses to boost your lead generation and outreach efforts.

• Email Warmup: This toolkit warmups your email domain to enhance your sending reputation. 

‍Pricing

‍Zerobounce’s offers its products for $49 per month.

7. Pipl

‍Pipl offers warmup features to ensure email deliverability. It supports all email service providers, allowing you to connect multiple mailboxes which you can warm up before sending. Its email warming feature utilizes a combination of natural and artificial words to bypass spam filtering, ensuring your cold emails reach your prospects’ inboxes. You can customize tracking words and schedule warm-ups to fit your business needs. Additionally, its auto-generate spintax feature creates multiple versions of email content, allowing you to personalize emails to fit your audience’s needs. This feature makes sure you send fresh and resonating content to each recipient, increasing the open and engagement rate. 

‍Pricing

‍Pipl’s pricing plan starts at $37 per month. 

Key Factors to Consider When Choosing an Email Deliverability Tool

With varieties of email deliverability companies out there, choosing the right deliverability tool can be a bit challenging. However, here are some factors you can consider to determine the best fit for your business. 

Determine Your Business Needs and Goals

Before you select an email deliverability tool, clearly define your goals and needs. They serve as a north star to help you scale through the process. Ask these questions to have a clearer understanding of your goals:

• What specific results do you intend to achieve in the short run of your email campaign? Do you want to improve the open and click-through rate? Or do you intend to improve conversions or your audience’s engagement rate? 

• How is your current cold email campaign performing? Assess the open rates, bounce rates, bounce rates, and unsubscribes to pinpoint areas of improvement. 

• How do you handle deliverability issues? Do you have a system that provides alerts? Or do you do things based on your instincts?

• Do you have a dedicated professional who handles all deliverability issues, including the technical aspects? Evaluate your team and determine whether you have an in-house expert or need external support. 

Consider its Email Infrastructure

The number of emails you send should determine the kind of infrastructure you use. The non-availability of these major infrastructures could hinder the high performance of your email campaigns. For instance, if you send a high volume of emails, you may need a dedicated IP address and multiple email accounts to warm up your email accounts. That said, here are some other features you should consider:

• Inbox Placement Feature: Your email deliverability tool should have functionalities that ensure your cold emails get into your inbox, not the spam folder. It should have features that simplify email authentication protocols like SPF, DMARC, and DKIM, manage sender reputation, and monitor your email campaign’s health to ensure optimal placement. 

• Detailed Reporting: A good email deliverability tool should provide detailed deliverability reports to improve your email campaign’s performance. It should offer insights into key metrics like open and click-through rates, spam complaints, bounce rates, deliverability scores, and more. These metrics will help you discover what’s working and areas that require improvement. 

• Integrations: A proper email deliverability tool should seamlessly integrate with your existing systems. It should be compatible with your sales tech stack to streamline your workflow and drive efficiency. 

Compliance and Regulations

Every country has a set of guidelines all email senders must follow when working with sensitive customer information. Hence, your email deliverability tool should comply with your country’s data standards and industry regulationsChoose a deliverability tool that abides by your country’s regulations to avoid potential legal issues. Countries like the United States implement the CAN-SPAM Act while European countries execute the General Data Protection Regulation (GDPR).

Pricing

Every email deliverability tool offers different pricing models that could influence the value you receive and affect your budget. Before you select a tool, consider its current expenses and long-term benefits to determine whether it’s worth your investment. Look out for any hidden costs such as extra fees for additional features or setup fees. By comparing these aspects, you can carefully select a particular tool that offers the best benefit for your business. 

Best Practices That Improve Email Deliverability

Sending out cold emails without implementing some deliverability measures will only frustrate your outreach efforts. Here are some best practices to improve email deliverability and help you have a successful outreach campaign. 

Authenticate Your Email Domain

Authenticated emails let the ESPs know the emails are coming from your end. If an email is sent from a domain that’s different from yours, they won’t trust it and could mark it as spam. By setting up authentication protocols like SPF and DKIM, you indirectly verify that you’re indeed the domain owner, preventing forgery and security threats. The DMARC policy combines the SPF and DKIM protocols to ensure the message’s authenticity. 

1. Set Up Secondary Domains

Creating secondary domains prevents your large volume of emails from ending in the spam folder and ruining your primary domain’s reputation.How? If you send your cold emails from a secondary domain and a deliverability issue happens, it’s less likely to affect your primary domain, maintaining its credibility. Besides, this separation helps you to determine the source of a deliverability issue and protect your domain reputation,  ensuring your emails end up in the prospect’s inbox. 

2. Warm Up Your Emails

Sending a large volume of emails without warmups could get your domain blacklisted by ESPs. To avoid this scenario, you must send your emails gradually in small quantities over a few weeks. This approach helps you to maintain a positive relationship with the ESPs. A manual warmup process is tedious and time-consuming. You can opt for an automated warmup tool to humanize the sending process and maintain your reputation. 

3. Send Engaging and Relevant Content

Irrelevant or boring content turns people off, resulting in unsubscribes or spam complaints which impact deliverability. Hence, you must send emails that resonate with your audience. This makes it more likely to open, read, and interact with them, boosting your engagement rate. Consequently, it signals to the ESPs that people value your messages, helping more of them land in inboxes instead of spam folders. 

4. Verify Email Lists

People often change emails due to different reasons, such as changing jobs, completing an educational program, and more. Without email verification, you can have an outdated email list filled with invalid email addresses. Hence, cleaning your email list helps to remove these errors and deal with active and valid email addresses. Clean the list quarterly to prevent sending to invalid email addresses which could increase bounce rate and impact deliverability. 

Email Deliverability Made Easier with ColdIQ

Every email deliverability tool has its strengths and weaknesses. The ultimate decision should align with your operational needs, budget, and overall business objectives. That said, ColdIQ remains one of the best outbound lead generation agencies that makes email deliverability hassle-free for your business. Thanks to our sales team and renowned expertise, we implement proactive deliverability approaches that drive your cold emails into the prospect’s inbox, promoting a successful email campaign. Get in touch with us today!