Re: Email question
From: Alexander Dalloz (alexander.dalloz_at_uni-bielefeld.de)
Date: 07/30/04
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Date: Fri, 30 Jul 2004 16:19:56 +0200 To: For users of Fedora Core releases <fedora-list@redhat.com>
Am Fr, den 30.07.2004 schrieb Cowles, Steve um 2:52:
> Note 3: When an invalid recipient was specifed (like during a dictionary
> attack), it was rejected after the "rcpt to"; thus no DSN/bounce was
> generated by sendmail. i.e. The rejection occurs before the inbound e-mail
> is submitted to the queue for delivery. Nice!!!
It is correct that invalid recpient addresses are rejected right after
the "RCPT TO: <address>" command. That is default Sendmail behaviour and
nothing invented with the access_db setup you give as an example.
It is wrong that the sender gets not DSN. Of course he gets one, just a
general one. If the Sendmail admin like he can specify a specific DSN
for unknown recipient addresses given by a sender. You yourself posted
the link where that is described:
ERROR:### any textas above, but useful to mark error messages as such.
ERROR:D.S.N:### any textwhere D.S.N is an RFC 1893 compliant error code
and the rest as above.
> Steve Cowles
Btw. you can handle such rejections too within a virtusertable - which
is already necessary for Jake as he hosts 6 mail domains. As an example
I have for each of the domains I host in the virtusertable following 2
entries (where the info@ address is not used by the customer):
info@customerdomain.de ERROR:5.7.1:550 we do not accept
merchandising SPAM
@customerdomain.de error:nouser no such user here
Has same effect as your access_db example setup, which is only for 1
domain.
Alexander
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