| Re: What this means "(\w|-)+@\w"? [message #175007 is a reply to message #175001] |
Tue, 02 August 2011 20:53   |
Eli the Bearded
Messages: 22
Registered: April 2011
Karma:
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Junior Member |
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In comp.lang.php, Peter H. Coffin <hellsop(at)ninehells(dot)com> wrote:
> Several years ago, I wrote an email validator that worked fairly will,
> and handled address cases that hadn't even been thought of yet. It used
> telnet to fake being a MTA to the MX of record for the domain through
> enough steps to ask if the receiving MTA would actually accept mail for
> the address, but stopping short of actually sending anything.
How did it handle temporary errors? Mail is supposed to be retried,
usually hours later. One common anti-spam technique is to exploit
that spammers often do not retry and to issue temporary "failure"
responses to every newly seen (sender,recipent) pair.
Elijah
------
not sure how often spammers get caught by that anymore
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