On 29 November 2010 01:56, Victor Duchovni <victor.ducho...@morganstanley.com> wrote: > On Sun, Nov 28, 2010 at 01:36:12PM -0700, ghe wrote: > >>> I run postfix and my mail clients use smtps so I was thinking I may as >>> well close port 25. How can I do that? >> >> I'd use iptables or equivalent. >> >> I have my doubts about postfix itself because I think that'd be an RFC >> violation. So far... > > The above is nonsense. You don't have to accept traffic on port 25 of > an MTA that is not an MX host (or whose IP is the A record) for a domain > that needs to accept external email.
How can you know if the inbound mail is coming from an MX host?
