On Fri, Sep 27, 2019 at 11:33:56AM -0400, Hugo Florentino wrote:
> > In 2019 there is no reasonable excuse for supporting submission via a port
> > 25 SMTP server that also accepts mail from the Internet in general for
> > local delivery. If you require your users to use a port 587 or 465
> > submission service instead, you don't need to make allowances for local
> > submission on the main port 25 service.
>
> This is one thing I was hopping to avoid, because I intended to enable
> authenticated access to port 25 through STARTTLS so that clients who
> use portable devices can check mail wherever they are withough having
> to change ports constantly.
This makes no sense. Portable devices use ports 587 or 465 with all
the other providers. And there's no "change ports constantly", they
just use the same submission port.
Remote MTAs connect to port 25, submission clients (MUAs) connect
to port 587.
--
Viktor.
