2021-03-14 10:36

Email address checking

If you want to check your list before the send-out, you can make address checks first. Either you use a service or you will have to program a little.

It works this way (SMTP protocol):

  • it helps if you order your list by domain first

  • use a different ip than your sending ip

  • start talking to the mail server of the domain of the email address you want to check

  • HELO, MAIL FROM have to be valid

  • RCPT TO: the-address@you-want-to.check

  • now the server tells you if the address exists or not

  • reset (RSET) the connection and check the next address for this domain

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