How to enable Incoming mail to postfix on port 587?

[David Fletcher]

On Mon, 2021-10-25 at 04:29 +0800, Bret Busby wrote:
> On 24/10/2021, David Fletcher <dave at thefletchers.net> wrote:
> > Hello,
> > 
> > I've been having troubles with the WiFi dropping out on my virgin
> > superhub 2 for a while so phoned them to complain about it. They've
> > sent out a hub 4 and a new TV box.
> > 
> > Today I'm aiming to get the hub 4 configured like the old superhub
> > 2
> > before they send a technician here tomorrow. I've got it set to my
> > network address and DHCP range then started trying to get the port
> > forwards set up.
> > 
> > I've been using port 25 incoming to my postfix server for years and
> > it's always worked fine but the damned hub 4 puts up a message in
> > red
> > saying that port 25 and a bunch of others are "reserved". What???
> > 
> > So far I've tried enabling port 587 and disabling port 25 on the
> > superhub 2 and making the adjustments I've found by Google
> > searching
> > the problem to the master.cf file:-
> > changing smtp towards the top to 587
> > enabling the submission line
> > enabling the smtps line
> > 
> > So far cannot get it to work. Obviously I don't want to plug in the
> > damned hub 2 until I have confidence that email will be working
> > when I
> > do!
> > 
> > Any further suggestions please? I'm running Ubuntu Server 20.04.3
> > LTS
> > 
> > Thanks everyone
> > 
> > Dave
> > 
> 
> If you are running postfix, then it is in your interest to be
> subscribed also to the postfix mailing list.
> 
> Because your message did not indicate in which country you are
> located, whilst, to me, it appears that your virgin access is a heap
> of <expletive>, perhaps, it may be time to try an alternative,
> depending on the available alternatives for wherever you are located.

I'm in England.

It's only very rarely (years between) that I normally have to involve
myself with this stuff so I forget... I think I might have been talking
BS above. Looking in the email config that I have on this laptop I use
port 465 to send outgoing email from anywhere using the secure SMTP
server at 1&1, which needs ID and passcode as does, I expect port 587.
Therefore I am now assuming that port 25 is the only port that can be
used for receiving incoming mail on my little home server. Therefore
disabling port 25 on a home router is a cretinous thing to do.

I did also ask on the local LUG mailing list and it seems that "vermin
media" is getting a bad reputation. It seems that I am not at all
unusual in having WiFi that keeps dropping out. It's down again right
now as I type this.

Their other division, mobile, I dropped a couple of years ago. Inspired
by Paul's letter of complaint to NTL, their predecessor, I ended up
composing a "Dear Cretins" letter to their customer services director
after they sent a letter demanding settlement of my 22 pence debt. I
taped the 22 pence in coins to the bottom of the letter.

The general opinion of the replies I have had from the Wiltshire LUG is
that I should be talking to either Andrews and Arnold or Zen Internet
which I will likely do tomorrow.

Dave