mailing list archives
Re: Major E-mail Delivery for FTC DNCR Launch
From: JC Dill <nanog () vo cnchost com>
Date: Wed, 25 Jun 2003 20:15:53 -0700
Leo Bicknell wrote:
* Make sure your mail servers are squeeky clean. Forward and
reverse match, valid MX's, they report their own name in SMTP
headers, no "untrusted sender used -f", etc. Valid abuse@
for the machine name, and the parent domain are essential.
Valid contacts for the domain and IP block are helpful.
In addition to having all the above properly setup so that your mail
servers appear squeekly clean from the outside, make sure they ARE
squeeky clean - on the inside. You may wish to raise this issue on the
spam-l mailing list:
The participants on spam-l will be happy to share with you the many ways
spammers relay thru web and mail servers, and how to ensure (and test)
that your servers can't be abused. All the pre-emptive whitelisting in
the world won't help you if your machines are open relays and spammers
start sending spew thru your mail servers. There are too many systems
that will automatically blacklist your IPs if they start spewing actual
spam, and then you will have to go one-by-one to each of them to get
unblocked. It's much better to avoid the problem by not letting your
machines send any spam in the first place!