If your emails aren’t getting into your prospects’ inboxes, nothing else matters. Not your exclusive offers, not your catchy subject lines, not even your calls to action.
Email deliverability tools exist for this very reason. They don’t just tell you if you’re hitting the inbox; they help you understand why you’re missing it in the first place.
These tools dig into the hidden side of email marketing: your sender score, domain health, spam trigger words, blacklist status, and even how your cold emails look to spam filters. Their goal? To help you catch problems before they ruin your outreach.
This article breaks down eight of the best email deliverability tools available today, what they actually do, and how to choose one based on the way you send.
Instantly
G2 Rating: 4.8/5 ⭐ with 3,678 reviews
Deliverability doesn’t just depend on your email copy or timing; it starts with how healthy your sender identity is. That’s exactly where Instantly.ai shines.
With Instantly’s Deliverability Network, your emails get sent and delivered right. Our platform uses a wide, peer-based warmup network to simulate real conversations across thousands of inboxes. This builds your sender reputation organically, so spam filters start recognizing your emails as legitimate, not suspicious.
You also get full control over how your account warms up. You can set sending volumes, daily limits, and ramp-up speeds—all tuned to your goals. And with Unlimited Deliverability Tests, you can always check exactly where your emails land: inbox, promotions, or spam.
Want to track how you’re doing? Instantly’s clean deliverability dashboard shows open rates, bounce stats, spam placement, and warmup activity so you’re never flying blind.
And because Instantly is built for cold email at scale, everything connects. The warmup tools, inbox testing, and sending logic work seamlessly with your campaigns. You can even pair it with Instantly’s lead finder or plug it into the Campaign Manager to roll straight from prep to prospecting.
Top Features
- Peer-to-peer deliverability warmup built for real inbox interaction
- Smart warmup settings to match your pace and volume
- Inbox placement testing, so you know where emails actually land
- Deliverability metrics at a glance in a focused, visual dashboard
- Easy integration with campaigns, contacts, and cold outreach tools
- Access to 450 million+ verified leads if you're building lists from scratch
Pricing
Instantly offers a free trial for you to experience its features and monthly subscription packages to fit your budget. Their deliverability plans are as follows:
- Growth: $37/month (5,000 emails monthly)
- Hypergrowth: $97/month (100,000 emails monthly)
- Lightspeed: $358/month (500,000 emails monthly)
- Enterprise: Custom Pricing (500,000+ emails monthly)
Folderly
G2 Rating: 4.8/5 ⭐ with 97 reviews
Folderly is an easy-to-use email management platform for boosting your account reputation with efficient spam testing features. It helps with regularly maintaining your sending practices with tools such as automated testing, email placement reports, IP insights, and domain health.
Their automated testing tool allows you to select a mailbox and an email template for it to rate. It assesses server authentication, blacklist status, and deliverability rate to determine how your emails affect your sender reputation. Once you are satisfied with your score, your emails are ready to send.
The email placement report presents vital deliverability metrics such as spam rates and inbox landings to monitor your account’s progress. This tool also supports multiple accounts, making keeping track of your deliverability accessible from one convenient place.
Top Features
- Inbox placement monitoring to ensure your emails reach the recipient's inbox
- Domain health checker to view your blacklist status and verify DNS settings to maintain a positive sender reputation
- Real-time spam notifications to keep you aware of which outreach is being affected by spam filters
- Cause and effect guidelines that let you know how your emails can be optimized to improve deliverability
- Integration with popular ESPs like Google, Outlook, Amazon, and Yahoo via API and SMTP for accurate reputation analysis
Pricing
Folderly offers three monthly subscription packages. Each package has its own unique tools and features to suit your particular use case. These packages include:
- Folderly: $120/month - For everyday maintenance
- Inbox Insights: $0-$79/month - Check email placements, IPs, and DNS records
- Pulse: $0/mo - Monitor spam placement and receive alerts
Mailgun
G2 Rating: 4.2/5 ⭐with 296 reviews
Mailgun is a platform that helps you reach your recipients’ inboxes with SMTP and API-based email-sending services. Their tools aim to scale your outreach by improving sending, engagement, and account verification to build your sender reputation and ensure deliverability.
Their sending tools are built on Google servers to ensure their authentication protocols validate your outreach and build your account’s reliability. The program allows you to track your emails to ensure they are appropriately verified and bypass any filters that harm your deliverability.
Mailgun utilizes API-generated keys to work seamlessly with app developers, allowing you to send emails through API and SMTP at a large scale. Integrate email triggers into your app and have Mailgun automate authentication and redirection to your recipient’s inbox.
Top Features
- Developer support with API integration into any app
- Email tracking to ensure your outreach meets the verification requirements of major email platforms
- Scheduled send times to trigger outgoing mail when your recipients are most likely to engage with it
- An analysis dashboard to track emails and monitor engagement rates
- Batch sending, allowing you to send 1000 personalized emails automatically
Pricing
Mailgun provides users with a free trial to test out their features and three affordable subscription packages to customize depending on how many emails you send, including:
- Free: $0/month
- Basic: $15/month
- Foundation: $75/month
- Scale: $90/month
ZeroBounce
G2 Rating: 4.7/5 ⭐ with 527 reviews
ZeroBounce improves your account reputation with an abundance of deliverability tools like email list validation, inbox placement and server tests, blacklist monitoring, and DMARC monitoring.
It features an AI-powered email scoring tool to assess your email’s design, content, and subject line to inform you of its impact on your reputation score and offer suggestions to improve validity.
ZeroBounce DMARC monitor improves your reputation by enhancing your account’s security and maintaining authenticity to ensure your company isn’t targeted by fraudulent accounts trying to impersonate you.
Top Features
- Email validation to clean your contact list of any invalid email addresses and spam traps
- Activity data that monitors your engagement’s outreach, tracking open, click, forward, and unsubscribe rates
- Email scoring to determine how natural ESPs perceive your emails
- A DMARC monitor to protect you from fraudulent accounts trying to impersonate you
- Blacklist monitors to ensure your domain doesn’t end up on any blacklists
Pricing
ZeroBounce uses a credit system with monthly subscriptions to top up your credits. This subscription package is customizable depending on how many emails you wish to send. The price breakdown is as follows:
- Monthly Rates: $18-$2,250/month (2,000 to 1,000,000 credits)
- Enterprise: Custom Pricing (over 1,000,000 credits)
InboxAlly
G2 Rating: 4.6/5 ⭐ with 24 reviews
InboxAlly is a cold email tool designed to help your outreach avoid the spam folder. It improves your open rate with warmup techniques to send your emails to a controlled inbox so you can see where your outreach lands. The inbox will also automate reading emails to mimic engagement and effectively build your sender reputation.
Setting up your controlled inbox is simple; just input your sending habits and engagement rules in the settings and let automation do the rest. From there, you can monitor which emails are struggling to reach the inbox and make the necessary adjustments to improve.
Top Features
- Controlled inbox for receiving your warmup messages to monitor and improve your sender reputation
- Automated scrolling, replying, marking as important, and link clicking for your emails to emulate natural reading practices
- Progress tracking metrics to track where your emails have been landing in the last 30 days
- Engagement templates to simplify warmup setup
- Compatibility with any IP/ domain on any platform
Pricing
InboxAlly offers three pricing packages and a customizable plan depending on how many accounts you wish to improve. Their price packages include:
- Starter: $149/month
- Plus: $645/month
- Premium: $1,190/month
- Enterprise: Custom
Everest by Validity
G2 Rating: 4.2/5 ⭐ with 188 reviews
Validity assists B2B outreach campaigns by combining valuable deliverability and verification programs in one convenient platform. Their product catalog includes CRM, deliverability enhancement, and sender certification tools to optimize the key aspects of your campaign.
Everest is designed to enhance your sender reputation with intuitive email monitoring, authenticating, and recipient analytics features to help your emails stand out in crowded inboxes. It allows you to test vital aspects of your email content, like design and subject line, to determine what engages your customers.
Campaign monitoring is made simple with its threat detection feature, allowing you to remain aware of any damage to your account reputation and gather insights for improvement. This tool also monitors real-time engagement analytics, so you are always up to date on your campaign’s progress.
Top Features
- Clear inbox placement insights to help you identify what’s impacting your account reputation
- Integrated list validation to identify recipients that can harm your deliverability
- Content design and subject line tests to ensure your messages bypass spam filters and see engagement
- Competitive intelligence analyzes and presents your competitors’ sending practices to give you an advantage
- Integration with major ESPs to ensure your content and account are compliant with their authentication protocols
Pricing
Everest has its own set of subscription packages with two custom options to fit the scale of your outreach operations. These packages are billed monthly and include:
- Elements: $20/month
- Elements Plus: $525/month
- Professional: Custom pricing
- Enterprise: Custom pricing
Glock Apps
G2 Rating: 3.7/5 ⭐ with 15 reviews
Glock Apps is a deliverability platform that provides users with advanced data insights to help them make data-driven decisions for optimizing their campaigns. It utilizes AI to analyze your email account and the content of your messages to determine what adjustments are required for improvement.
Its testing tool allows you to send emails to a seed list of accounts across popular ESPs like Gmail and Outlook. These tests determine where your emails will land and the issues that cause bouncing, spam filtering, or blacklisting.
In addition to thoroughly analyzing your email campaign, Glock Apps provides users with Action Steps, an AI assistant that generates recommendations for optimizing your account for the best deliverability.
Top Features
- In-depth content analysis that considers your email content, sender reputation, and recipient preferences to ensure inbox visibility
- Advanced testing tools to improve the likelihood that ESPs accept your outreach
- AI-generated suggestions for improvements based on your data analytics
- Domain analytics and blacklist monitoring to remain aware of issues that damage your sender's reputation
- A reliable spam-score assessment tested through major filters like Google, Barracuda, SpamAssassin, and Mimecast
Pricing
GlockApps offers four monthly packages and a free option for trying out its testing features. They also offer credit packs so you can determine your spam score without committing to a subscription. Their paid subscription plans include the following:
- Free: $0/month
- Essential: $85/month
- Growth: $142/month
- Enterprise: $185/month
TrulyInbox
G2 Rating: 3.0/5 ⭐ with 3 reviews
TrulyInbox is an email warmup tool that keeps operations simple in one user-friendly interface. It streamlines account integration and sending automation to reduce the hassle of manually building your sender reputation.
Their warmup tool helps your account appear more authentic to ESP analysis by emulating real human sending volumes to reduce the risk of flagging spam filters. Its intuitive performance analysis detects issues regarding your SPF, DKIM, or DMARC protocols and will automatically stop sending outreach to avoid harming your account reputation.
Top Features
- Simplified deliverability insights to monitor your campaign’s progress
- Customizable warmup schedules to control the volume and frequency of your outgoing messages
- Customizable reply rate to manage both sides of the outreach and make it appear more natural
- Intuitive reporting dashboard to check your deliverability score and the factors that are affecting it
- Affordable pricing plans with no cost per mailbox
Pricing
TrulyInbox offers five subscription plans with options to be billed monthly, quarterly, and annually. These packages include:
- Free: $0/month
- Starter: $29/month
- Growth: $79/month
- Scale: $189/month
- Business: $289/month
TL;DR
Short on time? Here’s a rundown of the highlights:
- Your deliverability is the likelihood that your emails will end up in the intended recipient’s mailbox and is heavily affected by your sender reputation.
- Instantly is a great all-in-one platform with a toolset to optimize the vital aspects of your outreach campaign, including automated warmup, AI data insights, and authentication enhancement tools.
- Folderly offers intuitive testing features to see where your outreach lands without impacting your account reputation.
- Mailgun is designed for app developers who wish to increase the deliverability of outreach by redirecting outgoing mail through verified servers.
- ZeroBounce ensures the validity of your outgoing mail and email account with DMARC monitoring to protect you from being impersonated by scam accounts.
- InboxAlly lets you build your reputation while testing your emails by managing both ends of contact to increase perceived engagement.
- Everest by Validity is a platform that provides monitoring, insight generation, and contact list management tools to improve your email visibility.
- TrulyInbox is a warmup tool that automates your outgoing mail to emulate natural sending practices.
Need an easy-to-use platform to reliably improve deliverability? Instantly’s deliverability network and campaign management guarantee better email marketing performance. Start your Instantly trial today!
