Re: Greylisting

Kevin Miller wrote:
> Jon Reynolds wrote:
>
>>I am considering greylisting as yet another layer for spam. I have
>>been reading the pros and cons and have a list of the servers that
>>will not try a resend. I can easily white list those servers when the
>>time comes, but I was wondering if anyone else uses greylisting and
>>their experiences with it.
>>=20
>>How many IP's or domains have you actually had to white list? Has it
>>been effective at stemming the tide of spam? Is it recommended or is
>>there something I missed in my reading that makes it a bigger headache
>>than creating a new cf for spamassassin?
>>=20
>>Thanks for any advice,
>
>
> I'm not greylisting, but I did implement greet_pause. If you're using
> sendmail 8.13 you might add:
>
> FEATURE(`greet_pause', `10000')dnl
>
> to your build. It provides some of the functionality of greylist but
> was already available. I saw a dramatic drop off in the amount of spam.
> What it's doing is putting the sending MTA "on hold" so to speak.
> Legitimate MTAs handle it just fine. Spam machines don't have time to
> wait so the connection is dropped and never picked up again.
>
> I whitelisted a couple of domains in /etc/mail/access but didn't spend
> much time on it after the first couple days. Nobody's called
> complaining their mail is being rejected, and it's been months since I
> implemented it.
>
> HTH...
>
> ...Kevin
> --=20
> Kevin Miller Registered Linux User No: 307357
> CBJ MIS Dept. Network Systems Admin., Mail Admin.
> 155 South Seward Street ph: (907) 586-0242
> Juneau, Alaska 99801 fax: (907 586-4500
> ---------

Thanks Kevin, that was also something else I was reading about and
wasn't able to find a good answer.

Jon
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Received on Wed Jan 4 18:23:44 2006