[NMLUG] Email service that does graylisting/razor/spamfiltering/etc?

[niosop at gmail.com (Matthew Bowie)]

What kind of daily traffic are you looking at?  I've been considering adding
spam filtering to my list of services, but I'm not sure if there's enough
demand to make it worth provisioning a server just for that, plus it takes a
fair amount of time to maintain.

I've had pretty good results using BL+SA+ClamAV but it is processor
intensive so it would need it's own server.  A well trained DSPAM filter can
do it in a much more processor efficient manner, but requires a lot more
training.  The best results so far have been with Blacklists -> DSPAM -> SA
-> ClamAV.  Use the output of SA to train DSPAM.  Since DSPAM is so much
faster (usually >10x faster) than SA, most of the spam gets caught there,
and you still get the advantage of a rules based filter like SA.

Anyways, doesn't help you at all, but was just curious how much traffic you
get.

Matt



On 4/9/07, havoc <havoc at harrisdev.com> wrote:
>
> http://www.junkemailfilter.com/spam/
>
> Pricing is reasonable, but with multiple domains, it might stack up in a
> hurry.
>
> I'm really happy with SpamAssassin, but my server has been spending more
> resources filtering spam than doing everything else for about the last 2
> years. I'm getting tired of that.
>
> jody
>
> Kelly Jones wrote:
> > I have about 20 domains, and any email to any of these domains
> > (anyaddress at any_of_my_domains.com) forwards to a single mailbox.
> >
> > I handle email for all these domains myself, but it's becoming a hassle:
> >
> >  % dictionary attacks mean I often get the same spam repeatedly
> >
> >  % I'm too scared to change my SMTP config (to setup graylisting for
> >  example) for fear of breaking something and losing email [not that
> >  99+% of isn't spam anyway...]
> >
> >  % My SMTP server sometimes gets flooded w/ connections (probably not
> >  denial-of-service-- just excess-of-spammers), delaying legit email.
> >
> > In short, I want to to give up: running a mail server used to be easy,
> > but it's not anymore.
> >
> > Is there a reliable, fairly inexpensive service that does graylisting,
> > razor-checking, sender address verification, RBL-checking, and other
> > spam filtering? Specifics:
> >
> >  % I'd like to set the MX records for all 20 domains to their server
> >  and be done with it.
> >
> >  % I do NOT want to forward email (to a spamarrest.com address for
> >  example). Forwarding means I still have to run my own mailserver +
> >  nullifies RBL checks, graylisting, etc.
> >
> >  % I'd like the option of having challenge-response ("you sent me an
> >  email + I don't know you -- go here and prove you're human"), but
> >  also the option of turning it off.
> >
> >  % Senders should always be notified (ideally at the SMTP level) if
> >  their message is rejected (ideally w/ a custom reject message that I
> >  choose). Messages shouldn't just disappear.
> >
> >  % I'd like the ability to check my email via POP/IMAP. Size limits
> >  are OK: I plan to download email regularly.
> >
> >  % Most of the email for my domains will come to just me, but I'd like
> >  the option to forward a copy of emails to certain addresses/domains
> >  to others. Example: email to *@domain1.com comes to just me, but
> >  email to foofoo at domain1.com (that makes it through the spam filter)
> >  comes to me and a copy gets forwarded to bob at gmail.com. This feature
> >  isn't critical: I can probably setup Pine rules/etc to do what I want
> >  if I have to.
> >
> > Any recommendations?
> >
> >
>
>
> --
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>
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-- 
Matthew Bowie
Programmer/IT Consultant
niosop at gmail.com
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