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