Re: Sendmail: How does one blacklist annoying spammers?

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On 06/25/2010 06:26 PM, Genes MailLists wrote:
> On 06/25/2010 05:56 PM, Greg Woods wrote:
>
>
> Historical thoughts on RBL:
>
>    You've had several suggestions so just a couple of comments.  The
> MAPS list (aka rbl) was an/the original DNSBL - if I remember right it
> went weird a long back and required you fill out a long legal doc (with
> a pen) which if your IP ever changed you needed to do the entire thing
> over again. There was a 'free' and a pay service.
>
>    It got too tedious to be useful - since then Trend Micro purchased
> them and now sells the service - what is still easily accessible I dont
> know.
>
>    The current way is to use the FEATURE(`enhdnsbl'). Many of these
> lists share a huge overlap in common - so adding the first RBL is a huge
> benefit - thereafter you may find little to no further benefit for each
> additional RBL you add. There is some cost to adding them tho' smallish
> for a home / small business site.
>
>
>     Here are some of the things I do (feel free to ignore!) ... for me
> spam is not zero but but it mostly quiet - every now and again I get a
> new spurt of a few a week then it goes quiet again.
>
>
>    1) FEATURE(`enhdnsbl', `bl.spamcop.net', `', `t', `127.0.0.2.')dnl
>
>    2) FEATURE(`greet_pause', `3000')dnl
>       I found 3 secs to work well for me you may tune as you see fit.
>
> ** 3) 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).
>
>    Good luck ... :-)
>
>  gene
>
>
> ** you will need FEATURE(delay_checks)dnl
>    as well.
>   
THANKS!  I have implemented the above recommendations
as well as a few other advices in this posting.

Thanks to all who participated - all very interesting to
know how others have tackled the their spam issues.

I will report how it all goes for me as I was getting at least
250 spam messages a day... it was getting on my nerves :/


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