Email Hippoemailhippo.com
Email verification service that checks syntax, domain, mailbox existence, and disposable-provider status. Has a limited free tier.
emaildetails
tools / verify-email-address
Verify Email Address
Free SMTP-level check of whether a mailbox exists, without sending an email.
freeweb
field note
Catch-all domains accept every address, so a "valid" result on a catch-all domain proves nothing.
used in playbooks
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