[CS-FSLUG] using postfix or sendmail to send mail
Frank Bax
fbax at sympatico.ca
Thu Mar 12 13:34:48 CDT 2009
Jonathan E. Brickman wrote:
> Your ISP is almost certainly blocking SMTP traffic from its clients;
> many do these days. It is possible to build your own smarthost, given a
> more expensive commercial Internet connection explicitly set up for the
> purpose, but there are more things to do. You'll need a static IP,
> forward and reverse DNS on that IP, and an SPF record ( www.openspf.org
> ) to do well. And within 24 months DNSSEC will start to get serious;
> that will have very interesting ramifications.
If you decide to go with static ip address; you should have ONLY the
mailserver at this ip address. If you put the static ip address on a
NAT router; then you expose yoursefl to different problems.
I recently had to fix a situation where a company had this setup.
A workstation at this site got infected with a spambot. The volume of
spam caused the static ip address to be blacklisted; causing problems
for outgoing email from the mail server.
If you want a static ip as Jonathon describes; that you should seriously
consider two (or more) static ip address and put mail server on a
separate ip than the rest of computers at the same site.
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