Re: Sendmail: How does one blacklist annoying spammers?

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In case you missed this post - here is a reasonable recipe based on many
years of senamil server admin'ing - feel free to modify, improve or ignore!

On 06/25/2010 09:26 PM, Genes MailLists wrote:
> 
>    
>    1) FEATURE(`enhdnsbl', `bl.spamcop.net', `', `t', `127.0.0.2.')dnl
>        Add more if you want, but additional RBL's do not add too much.
> 
>    2) FEATURE(`greet_pause', `3000')dnl
>
>       Remove the GreetPause delay for any trusted hosts - not vital >
      but will speed up incoming mail from trusted MX hosts.
>
>  e.g.
>
>       GreetPause:mail-bw0-f1.google.com    0
> 
>    3) FEATURE(delay_checks)dnl
>       FEATURE(`block_bad_helo') dnl
>
>    4) FEATURE(`require_rdns') dnl
> 
>    5) Maintain access list -
>       - mine contains (large) number of netblocks
>       - use senderbase to help identify netblocks and get more info
> about IP's.
> 	http://www.senderbase.org
>      - only look at the last Received line hitting your mail server
> 
>       You may choose what you want to block here - e.g. residential IP's
> 
> 
>    6) I have also iptable Firewall blocks for undesirables (I use some
> country blocks in addition to a list of naughties)
> 
>    7) run spamassasin (at the back end not the border server if you're
> running internal and border sendmails).
> 

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