Help with large message / blacklists bypassed
MailScanner at ecs.soton.ac.uk
Wed Aug 1 15:12:48 IST 2007
Glenn Steen wrote:
> On 01/08/07, am.lists <am.lists at gmail.com> wrote:
>> OK. I admit that I may be in panic mode and not thinking this thorugh
>> as completley as I would otherwise.
>> Standard support disclosure; Linux + Postfix 2.2.2+ MailScanner 4.58.9
>> (<-- I know, slacker), ClamAV (0.90.3).
>> One of my users is the recipient on an email message that is
>> apparently stuck in the sending MTA's outbound queue. For whatever
>> reason, their MTA has shipped me over 3000 copies of the identical
>> piece of mail.
>> Problem on my side is that it's a 670KB message (has a lot of images
>> attached) and I seem to be ineffective at blocking it and this guy's
>> mailbox keeps getting clogged up. Not to mention how this guy feels
>> each time his Outlook client goes out and tries to fetch 10 copies of
>> a 670KB message. He's getting no work done, essentially.
>> My process:
>> (1) I didn't want to block everything from this particular sender --
>> it's not his fault, obviously, so I looked for a unique string within
>> the message and created a custom SA rule (50 points) to kick it into
>> definite spam. I'd really like to strangle the mail admin on the
>> otherside, but I can't quite reach him from here. :-)
>> Result: Message too large (I hadn't noticed that detail before) so it
>> skips it with the spam report saying simply "too large"
> (A sort of ...) Solution: Up your Scan and SPamAssassin Size limits in
> MailScanner.conf ... Don't forget to restart/reload MS to take effect.
>> (2) Blacklist by sender -- added to MailScanner/MailWatch via the
>> black/white page. The sender and recipient are fully stated.
>> Result: No Effect. ??? I'm confounded by this. I thought blacks/whites
>> were still checked here.
>> (3) Added the sender name to my spam.blacklists.rules file, relevant
>> lines below:
>> # spam.blacklists.rules file
>> # edited at edited.org problem
>> From: edited at edited.org yes
>> # Never set this to yes.
>> FromOrTo: default no
>> Result: Still no effect. Messages, all 100 or so of them this
>> morning, are coming thorugh just fine.
> And you did remember to restart MailScanner after those changes? That
> will affect the MW SQL B/W-list too, sort of;-).
You could create a SpamAssassin rule that will spot this message, then set
SpamAssassin Rule Actions = YOUR_NEW_RULE=>delete
then 'service MailScanner reload'.
>> Where to look / what to do next on this?
Julian Field MEng CITP
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