spam avoidance (was Re: cpu speed problem)
Andy Green
andy at warmcat.com
Mon Jul 30 22:45:37 UTC 2007
Somebody in the thread at some point said:
> At 11:25 AM +0100 7/30/07, Andy Green wrote:
> ...
>> - insist on proper Helo FQDN (lot of spam tools and viruses don't
>> take care of this)
> ...
>
> Do you require the name to be real, or only in valid form? That is, do you
> do a DNS lookup on the name?
All of the above.... (this is from /etc/postfix/main.cf)
smtpd_helo_required = yes
smtpd_helo_restrictions =
# our personalized list of accepts and denys based on HELO name
check_helo_access hash:/etc/postfix/helo_access,
# talk to our local boxes that want to send through us
permit_mynetworks,
# no Reverse DNS gets the boot
reject_unknown_client,
# reject bad syntax hostname
reject_invalid_hostname,
# non FQDN gets the boot
reject_non_fqdn_hostname
and after that it checks it against the blackhole DNS server and then
greylisting.
-Andy
More information about the fedora-list
mailing list