How to enable Incoming mail to postfix on port 587?

[David Fletcher]

Solved!

Virgin Media is about get dumped.

I'm not an expert on this stuff but as far as I know the "standard"
SMTP ports are 25, 465 and 587. Again, as far as I know the first is
always open to everybody and the latter two are used for secure SMTP
i.e. can only be accessed by the holder of a valid user ID and
passcode. 465 and 587 are used by folks such as myself for relaying
outgoing email. Users such as myself who run their own mail server at
their premises need to use port 25 for incoming email because you can't
set up every other mail server on the Internet with your own ID and
passcode.

If I'm incorrect about any of the above paragraph please say so.

Last week I had Openreach here to install a fibre optic Internet
connection directly into my "playroom" in my house. Zen Internet had
sent me a router a few days beforehand, something called a Fritzbox. So
far as setting up port forwards is concerned it is unfortunately no
better than the Virgin hub 4.

OK that's the end of the woes! A good friend recommended I purchase
from an eBay seller a second hand TP-Link router which the seller had
re-flashed with Open-WRT. That is the solution. Open-WRT is clearly
intended for those who know what they want of their Internet connection
and freely permits the setting up of whatever port forwards the owner
desires. Apparently I need to be installing an update on it some time
but for now it has to just sit there and work as it is doing for
another week because of a GPX route file for the classic car club that
needs to be sent out upon request.

Zen Internet don't care at all what router is plugged into the fibre
optic terminal and provide in advance the access codes for the PPPoE
setting.

Dave