> As a quick note on this, Declude does not suffer this problem if configured
> correctly. We have a backup mailserver that get hits by spammers hundreds
> of times a day. As the server essentially forwards any messages on, Declude
> still tests the message and catches any spam.
But since the spam isn't detected until it reaches the primary, you can't reject it at the SMTP phase before the spammer has disconnected. You end up bouncing to the From or Reply-to address, which is often forged.
Bounce? Yuck! We strongly discourage our customers from bouncing E-mail.
It's funny -- a lot of mailserver admins think that either [1] bouncing spam will cause them to get off of spam lists, or [2] bouncing spam will cause the spammer to get a big inbox that will be difficult to wade through. But, spammers almost never ever get bounces. They use fake return addresses, and when they use their own software to send out spam, they don't keep track of the rejected E-mails.
Heck, spammers care so little that they send spam as if it was a dictionary attack! That means that they are willing to have spam runs that send to something like 20-100 non-existent E-mail addresses just to get a single spam through. They have the power with the 100,000s of compromised servers they have.
You should always use the same spam and AV rules on all servers responsible for a domain, so that any rejection or bounce happens at first submission.
Our customers have saved $10,000s or more by not running anti-virus/anti-spam software on backups. :) It often isn't possible to use the same rules anyways, if you swap secondaries or pay for a hosted secondary.
-Scott
---
Declude JunkMail: The advanced anti-spam solution for IMail mailservers.
Declude Virus: Catches known viruses and is the leader in mailserver vulnerability detection.
Find out what you've been missing: Ask about our free 30-day evaluation.
--- [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)]
To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
