[lug] Lots o' email bounces

[George Sexton]

The things we do, to combat spam are:

1) Require fully qualified HELO. This drops around 50%.
2) Use the SpamHaus RBL. This drops something like 40-45%.
3) Use SPF. This drops a couple of percent, but it keeps are domain from 
getting used quite so much.
4) Use bogofilter for the balance.

Between these three things, 98-99% of inbound spam never makes it in. I 
see maybe 5-10 spam messages a day. The HELO thing has never personally 
caused a problem for me. I had a client that it caused a small problem 
for, but when I explained how effective it was, they told the other 
party to fix their mail server.



John Hernandez wrote:
> karl horlen wrote:
>> However, SPF only works on those receiving email servers that 
>> implement it meaning it's only foolproof at some percentage less than 
>> 100% for the bounce problem mentioned here.
> 
> True, but in practice it can make a huge difference in the volume of 
> bounces, because the SPF-protected domain will be MUCH less attractive 
> to skilled spammers in the first place.  They usually move on to softer 
> targets.
> 
> -John
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-- 
George Sexton
MH Software, Inc.
Voice: +1 303 438 9585
URL:   http://www.mhsoftware.com/