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Brad Fitzpatrick

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DHCP users [Jul. 17th, 2004|10:44 pm]
Brad Fitzpatrick
I followed tydel's advice and setup danga.com's postfix to not accept mail from DHCP addresses. If you try to send mail to me or anybody @danga.com now from your home DHCP server, you'll get:

554 DHCP Pool clients should use their ISP's mail server

Tailing my mail.log, it sure is rejecting a shitload of messages!

But really, you shouldn't be running an MTA on your DHCP address anyway. I know this will block some geeks who just want to run their own mail server, but they should be smarthosting it elsewhere.

Next step: ClamAV? That's the one you recommended, right scsi?
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Comments:
[User Picture]From: scsi
2004-07-18 12:06 am (UTC)
Hey brad! How do you tell postfix to block DHCP.. er....... heh nevermind..
(Reply) (Thread)
[User Picture]From: jc
2004-07-18 12:45 am (UTC)

Boom boom.

Still not sure though what benefit blocking mail from DHCP hosts has, unless it's to curb a crapload of spam coming directly from infected boxen rather than ISP mail servers.
(Reply) (Parent) (Thread)
[User Picture]From: brad
2004-07-18 11:04 am (UTC)
So much spam (and viruses) comes directly from infected Windows machines, rather than going through their ISP's mail servers (where the ISP might, maybe, presumably filter or raise alarms)
(Reply) (Parent) (Thread)