On 2013-03-14 Percy Kwong wrote: > I would have smtpd listen on an additional port. (You'll need this > for some circumstances). In addition, I would also tighten up your > iptables rules and make sure nobody can get to your mysql server > socket/port. > > > In master.cf, add the following line: > > # Have SMTPD listen on port 825 as well for remote users that have > port 25 blocked. This will allow authentication and connectivity on > the server from some remote users. > 825 inet n - n - - smtpd -v
The canonical port for message submission in this scenario is 587 (see RFC 6409). As required per that RFC you must enable authentication on that port. Also, do *not* enable verbose logging (-v) unless specifically asked to do so. Regards Ansgar Wiechers -- "Abstractions save us time working, but they don't save us time learning." --Joel Spolsky
