MailerCheck is an email verification and deliverability platform designed to help businesses maintain clean subscriber lists and improve the performance of their email campaigns. Its tools let users verify individual addresses, upload full lists for validation, or check new addresses in real time through an API. Automated recommendations and usage reports support ongoing list maintenance and better collection practices.

For campaign testing, Email Insights analyzes content for potential issues such as spam-triggering words, broken links, and blocklists. Inbox Placement helps users assess whether messages are likely to reach inboxes or spam folders, with testing against major providers including Google, AOL, and Yahoo. MailerCheck also offers integrations with platforms such as Mailchimp, MailerLite, ActiveCampaign, GetResponse, ConvertKit, Zapier, and Make.

The company provides API documentation, a knowledge base, articles, video tutorials, and customer support resources. Pricing includes pay-as-you-go credits, with no long-term commitments stated on the site. MailerCheck says it serves more than 258,100 customers worldwide and offers 10 free credits to new users.