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+--- Thread: ISP Mailserver on Blacklist ?! (/thread-103.html)
ISP Mailserver on Blacklist ?! - BeNe - 01-18-2007 01:31 AM
Hello!
I had registerd me this mornig in this Board.
I waited for an
Activation -eMail - but nothing happend.
After some hour i taked a look at the Mailserverlog and see this on:
2007-01-17 16:19:08 H=ns2.g-housing.de (mail.g-house.de) [81.169.13x.xx] F=<w e b m a s t e r @i n e t c e n t r a l . d e > rejected RCPT <me@mydomain.tdl>: DNSBL listed at psbl.surriel.com
just for info
Greetz BeNe
RE: ISP Mailserver on Blacklist ?! - Attila - 01-19-2007 05:56 PM
These blacklists are not reliable and should not get used to block email. Doing so is allowing a private organization to censor your emails.
You can and should use these blacklists as a part of the spamassasin check for spam. If a sender is on such a list, it is a high amount of points in the spamfactor calculation.
There are more and less reliable blacklists. I dunno about surriel. Some others I use, and I do not see false positives.
The worst of all is the DUL list of SORBS, they do block off business users, with legitimate servers in big parts of Asia and Australia. Usually they do not answer any complaints, but justify their actions with flimsy tests and with IEEE drafts, to which a mailserver would not comply. What they do not tell you is that they themselves wrote this IEE draft they're referring to, and to which they want to force you to comply.
If you want to fight spam then use tumgreyspf, a greylisting filter for postfix, or similar. There are no false positives, but 90% or more of thespam does not get through.
Then add spamassasin with clamav, which takes care of the rest.
Some notorious US corporations specialized in spamming, which still get through, you can block by blocking their IP range in postfix access filters.
As a result our customers dare to switch on again catchall email accounts, the amount of spam getting through is no problem anymore.
RE: ISP Mailserver on Blacklist ?! - ephigenie - 01-19-2007 08:29 PM
our mailserver is clean.
But I'm hosting several Communities which send weekly Newsletters to their customers - customer can opt-in and opt-out of course
.But the amount of outgoing mail is high.
We're using greylisting, spf (yeah i know its more cosmetic) and maia.
We're just thinking about implementing domainkeys support in our system.