MailerCheck

Email list verification and deliverability testing tool

Email & Phone Validation
★★★★★ 4.8
2019 Founded
unknown Employees
235,824+ Customers
New York City, NY, United States Headquarters
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Quick Facts

✓ Free Trial
Website
mailercheck.com →
Starting Price
10
Pricing Model
freemium
Free Trial
unknown days
Company Type
private
Social
LinkedIn Twitter/X

About MailerCheck

MailerCheck is a cloud-based email list verification and deliverability testing platform designed to help businesses keep their subscriber databases clean and protect sender reputation so that more campaigns reach the inbox instead of the spam folder. It combines bulk and real-time email validation with content analysis, inbox placement testing, DMARC reporting, and blocklist monitoring in a single interface. mailercheck.com MailerCheck supports one-off list cleaning as well as ongoing monitoring, making it useful for both occasional senders and high-volume email programs.

The core of the product is its email verification engine, which can validate single addresses, uploaded CSV/TXT lists, or emails collected via forms and APIs in real time. Verification results classify addresses as valid, risky, or invalid, with granular statuses such as catch-all, disposable, role-based, mailbox full, mailbox not found, syntax error, typo, and more, along with recommendations for how to treat each category. Unknown statuses are not charged, and duplicate emails can be removed without consuming credits. mailercheck.com Beyond list hygiene, MailerCheck’s Email Insights feature scans message content and technical settings for spam triggers, blocklist issues, authentication problems, broken links, and HTML errors, while Inbox Placement tests how campaigns will land across major mailbox providers like Gmail, Yahoo, Outlook, and AOL before you send. mailercheck.com

MailerCheck also includes DMARC monitoring and blocklist monitoring tools to help teams understand how their domains and IPs are being used, detect spoofing or phishing, and get alerted if they appear on major blocklists. Detailed usage and validation reports show how credits are spent, where lists originate (uploads, integrations, API), and how list quality evolves over time, helping teams refine acquisition sources and improve deliverability strategy. mailercheck.com The platform is fully GDPR compliant and runs on modern infrastructure, with a documented REST API and SDK-style examples that make it straightforward to embed verification into custom apps and workflows. mailercheck.com

MailerCheck was created by the team behind MailerLite, a long-standing email marketing platform, to give senders an easy-to-use way to take responsibility for list health and deliverability. Launched in 2019, MailerCheck operates as MailerCheck, Inc., headquartered in New York City, New York, and serves a global customer base of more than 235,000 users across industries. mailercheck.com

Key Features

Bulk email list verification - Upload CSV or TXT files and validate large email lists in a few clicks, cleaning invalid and risky addresses.

Single email verification - Instantly check individual email addresses to confirm whether they are safe to send to.

Real-time verification API - Use a REST API to validate new email addresses at signup or in your applications so bad emails never enter your lists.

Granular verification statuses - Classify addresses as valid, invalid, disposable, catch-all, role-based, mailbox full, mailbox not found, syntax error, typo, and more with recommendations on how to handle each.

Free duplicate removal - Automatically remove duplicate email addresses from uploaded lists without consuming verification credits.

Email Insights content analysis - Scan message content, links, headers, and HTML for spam-like wording, blocklist issues, authentication problems, and broken links before sending.

Inbox Placement testing - Send pre-flight tests to seed inboxes at providers like Gmail, Outlook, Yahoo, AOL and more to predict where emails will land (inbox, spam, or other folders).

DMARC monitoring and reporting - Create and monitor DMARC records to see how your domains are used for sending email and to detect spoofing and phishing attempts.

Blocklist monitoring - Track your IPs and domains across major blocklists and receive alerts so you can take action before deliverability is hurt.

Usage and credit reports - Analyze validation history, list sources, and API usage from centralized reports to understand how acquisition channels affect list quality.

Automated recommendations - Get guidance on how to segment or remove addresses based on verification results to maintain healthy, engaged lists.

GDPR-compliant data protection - Process subscriber data in a platform built to meet GDPR privacy and security requirements.

Team and domain management - Subscription plans include multi-user access plus configurable DMARC domain and blocklist monitor limits for teams.

Native ESP integrations - Direct integrations with major email marketing tools so you can sync lists for cleaning and push back cleaned results.

Developer-friendly documentation - Comprehensive API documentation and guides to help developers embed MailerCheck into custom workflows and products.

Pros & Cons

👍 Pros

  • Very easy to use with a straightforward flow for uploading lists, running verification, and downloading or syncing cleaned results.
  • Seamless native integration with MailerLite and smooth connections to other ESPs, making it simple to add verification to existing email workflows.
  • Flexible credit-based pricing that avoids mandatory subscriptions and is cost-effective for occasional or seasonal list cleaning.
  • High accuracy and detailed verification reports that identify syntax errors, typos, catch-all, disposable, and role-based addresses, improving list quality.
  • Users report noticeable improvements in open rates and deliverability after cleaning lists, and praise fast, helpful customer support.
  • All-in-one toolkit that combines verification with Email Insights, Inbox Placement, DMARC, blocklist monitoring, and usage analytics in a single platform.
  • Developer-friendly API and documentation that make it simple to embed verification into custom forms and internal systems.

👎 Cons

  • Some reviewers feel pricing can be a bit expensive compared to the lowest-cost competitors, especially at higher volumes.
  • Occasional timeouts or delays have been reported when verifying very large lists, although issues are typically resolved quickly by support.
  • Workflow automation and trigger options are limited compared to more mature marketing automation platforms, and some users want deeper automation.
  • Catch-all classification still requires manual judgment, which can make it hard to decide whether to keep or remove some addresses.
  • A few non-technical users would like more prescriptive guidance on how to fix template issues flagged by Email Insights or deliverability checks.

User Reviews

G2
4.6
★★★★★
Capterra
4.9
★★★★★
TrustRadius
10.0
★★★★★

Integrations

MailerLite MailerLite Classic Mailchimp ActiveCampaign GetResponse ConvertKit HubSpot Brevo Pipedrive SendGrid Mailgun Freshdesk Ontraport Google Sheets Google Forms Google Drive Google Ads Google Calendar Zapier Make Integrately

Best For

Company Size

smb mid-market enterprise

Industries

SaaS E-commerce Marketing & Advertising Media & Publishing Nonprofit

Use Cases

Email list cleaning and hygiene before major campaigns or ESP migrations Ongoing deliverability optimization for newsletters and lifecycle email programs Validating cold outreach and prospecting lists to reduce bounces and protect sender reputation Monitoring DMARC and blocklists to catch abuse or configuration issues early Testing email content and inbox placement before sending large campaigns

FAQ

What is MailerCheck?

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MailerCheck is a cloud-based email verification and deliverability platform that helps businesses clean and validate email lists, analyze email content, test inbox placement, and monitor DMARC and blocklists. It provides bulk and real-time email verification, Email Insights for content and technical checks, Inbox Placement testing across major mailbox providers, and tools to monitor domain reputation, all designed to improve deliverability and protect sender reputation.

How much does MailerCheck cost?

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MailerCheck uses a combination of pay-as-you-go credits and monthly subscription plans. Credit pricing starts at around $10 for 1,000 email verifications, with lower per-credit rates available at higher volumes. Subscription plans begin with a Free tier that includes 1 DMARC domain and 2 blocklist monitors, followed by Basic at $125/month, Premium at $275/month, and Enterprise at $975/month, which adds higher limits and more users. A limited number of free credits are included when you sign up so you can test the service before committing.

What are the main features of MailerCheck?

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Key features of MailerCheck include bulk and single email list verification, real-time verification via API, detailed status codes for each address, free duplicate removal, Email Insights content and spam checks, Inbox Placement testing, DMARC monitoring and reporting, blocklist monitoring, and usage and credit reports. It also offers native integrations with ESPs like MailerLite, Mailchimp, ActiveCampaign, GetResponse, and ConvertKit, plus connectivity through Zapier, Make, and other automation platforms.

Who are MailerCheck's main competitors?

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MailerCheck's primary competitors in the email verification and deliverability space include ZeroBounce, NeverBounce, Bouncer, Kickbox, Clearout, and similar tools that provide bulk and real-time email verification. Some transactional email providers like Mailgun also offer verification as part of a broader email infrastructure stack. Compared to many of these, MailerCheck differentiates itself by bundling verification with content analysis, inbox placement testing, DMARC, and blocklist monitoring.

Is MailerCheck good for small businesses?

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Yes. MailerCheck is well suited to small businesses and solo operators because it is easy to use, does not require deep technical knowledge, and offers flexible pricing. Small teams can sign up for free, use the included credits to test the service, and then purchase additional credits only when they need to clean a list. The credit-based model and free tier mean you can keep costs low while still maintaining good list hygiene and deliverability, and you can grow into the paid plans as your sending volume and monitoring needs increase.

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