On Thu, Oct 09, 2003 at 06:40:12PM +0200, David Saez wrote:
|
| > One aspect of spam noted by a friend of mine in the computer security
| > business is that many spam programs don't re-try if they get a soft
| > error the first time.
|
| we tried greylisting for some time, the problem is that there are lots
| of legal mta's out of there that alkso don't retry.
|
"Legitimate", yes. "Legal", not acccording to RFC2821 :)
Yes, they need to be whitelisted by hand, which is a pain.
Yahoo Groups is an example of a non-retryer.
Yahoo in general seems to have trouble with mail: I turned on sender
address verification for a while and it worked great. Then I
saw Yahoo happily accepting forged, bogus recipients, like
3q5yreag(_at_)yahoo(_dot_)com(_dot_) That was disappointing.
If you're interested in sender address verification, I believe Exim and
Postfix support it.
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