Re: email verifier
Re: email verifier
- Subject: Re: email verifier
- From: Thomas Engelmeier <email@hidden>
- Date: Wed, 16 May 2007 13:44:34 +0200
Am 16.05.2007 um 13:16 schrieb René v Amerongen:
An email verifier checks if an email address exists.
It sends something to a email server without the body, just pings
for the user.
If the server reacts with the right code then you know if the email
adres exists.
You mean something that sends out these empty SPAM verification mails
most users occasionally receive?
There is no protocol for mail servers that ensures a address really
exists, and that is pretty fortunate, otherwise we all would get even
more penny-enlargement-rubbish.
The four possibilities for handling non-existent users are
- reply with an 550 invalid recipient
- forward the mail to postmaster (or use catch-all)
- accept and silently discard the mail
- log the originating IP and prepare for blacklisting and other
counter-UCE measures
The only working approach is sending an opt-in message to the address
at data entry, i.e. with an text body explaining the recipient you'd
like to know if the receiver wants to receive mail and enabling that
particular record if the recipient agrees to establish communication
by sending back a mail with an verification token or clicking an
unique URL.
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