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Spam help

limcollege
I am running 6.304 with:

RBL:
zen.spamhaus.org
bl.spamcop.net
list.dsbl.org

On-
Deny RCPT Hacks
SPF fail check 
Verify recipient

Block several File Extension

Spam threshold 3-6- Quarantine

Over 6- Blackhole

Recently I have several users getting lots of spam.  I understand its impossible to block all spam, but these all look similiar.  They use regular text with a URL here and there.  Other messages use Images and some text too.

I have some users who get 20 a day.

Anyone have advice on how i can improve my spam filter?


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Parents Reply Children
  • 0 in reply to SilverOne
    The amount of time before the remote mail server retries when greylisting on can vary greatly from 10 minutes to never depending on a number of factors such as whether or not the remote server will attempt delivery from the same IP address or how broken the remote server is.

    However once a greylisted email is accepted subsequent emails are delivered immediately.

    If you can live with the occasional delay and non-delivered email incurred from greylisting, it works very well to reduce the amount of spam.
  • 0 in reply to drees
    Limcollege,

    You can set extra RBL's:
    1          
    list.dsbl.org       
    2          
    relays.ordb.org          
    3          
    sbl.spamhaus.org          
    4          
    cbl.abuseat.org           
    5          
    combined.njabl.org            
    6          
    sbl-xbl.spamhaus.org
  • 0 in reply to SilverOne
    Thanks for the advice.  Greylisting doesnt seem like something i want to attempt.
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