mails.so
Unbeatably simple email validation
mails.so is an email validation service that checks whether an address is valid, exists, and can receive mail. It is used to clean contact lists, remove invalid recipients, block fake users and bots, and prevent fraud, with checks covering format, delivery, email profiling, and blocklists.
The service offers a no-code API, list validation, and an Email Finder. It integrates natively with Mailchimp and HubSpot, and connects to tools such as Salesforce, ActiveCampaign, Zapier, and Make. It is GDPR compliant and reports 99.99% availability.
mails.so is aimed at newsletters, e-commerce, SaaS, and marketing campaigns, with use cases in email marketing, bot signup detection, and fraud prevention. A free plan includes 50 credits. Paid editions are Pro, Business, and Unlimited, each with a monthly validation allowance (unlimited on the top tier), concurrent validation limits, and optional top-ups; all include API access, list validation, and the Email Finder. Plans can be cancelled at any time.
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