MailerCheck

MailerCheck is pay-as-you-go email list verification and a real-time validation API with inbox placement and content tests, on credits that never expire.

MailerCheck is MailerLite's email verification tool, for a marketer cleaning a list before a send and a developer who wants a validation API on credits that do not lapse. It has been part of Vercom S.A., the listed Polish cloud communications group, together with MailerLite and MailerSend since the merger was finalized on 21 June 2022. Bulk list verification takes a list of up to five million addresses, and the real-time verification API checks one address at a time, with each address coming back as valid, risky or do not send. Syntax, mailbox and catch-all detection, disposable and role account detection and typo flags explain the verdict, and duplicates are removed from an uploaded list at no charge. Native integrations pull lists from MailerLite, Mailchimp, ActiveCampaign, Kit and GetResponse and write the results back, and Zapier and Make connectors cover the rest. Two further tests run on credits: Email Insights sends a campaign to a generated seed address and reports spam-filter results, HTML validity, content flags, link health and SPF and DKIM authentication, and the inbox placement test shows whether the same message lands in the inbox, promotions or spam at eight mailbox providers including Gmail, Outlook, Yahoo and Proton. Usage reports break results down by type, and an autopay credit recharge keeps the balance topped up. MailerCheck suits marketers cleaning a list before a send, developers validating signups through the API, MailerLite and Mailchimp users who want native list cleaning, and teams that prefer credits over a subscription. It is sold on one model: credits bought in advance that never expire, one credit per address verified and a fixed number per Insights or placement test, with a minimum order, volume discounts on larger packs and a small batch of free credits on signup. The plan cards list the credit packs. In daily use MailerCheck cleans an aged or imported list before a campaign, validates addresses at a signup or checkout form, tests a campaign for spam triggers and broken links and checks inbox versus spam placement before a send. It sits beside the email platform that sends the campaign rather than replacing it, with ongoing deliverability monitoring handled by its sibling MailerSend.