Mailserver: DNS Check for From:

[Michael Gschwind]

Gerald Pfeifer wrote:
> 
> How about enabling a DNS Check for the From: which is used to send
> mail to the egcs/gcc.gnu.org server?
> 
> Replying to asocial guys like the following
[line removed]
> is not possible and frustrating if one does not check carfully enough.
> 
> Sendmail can do this kind of checks with a single line in the config
> files and I am sure that it should also be easy to do with qmail.

I can understand why somebody would want to do something like this... 
Especially in cases
where there is also an archive, which any spammer out there can search
for the regexp .*@.* 
In fact, I'm quite hesitant to post to anything that maintains an
archive, for 
exactly that reason -- if you were to do a DNS check, there are still
other ways to 
invalidate the address mike-nospam-@myplace.com