Re: Postfix and local mail redirection

[Sad Clouds <cryintothebluesky%gmail.com@localhost>]

On Tue, 26 Nov 2024 11:30:27 -0800
"Greg A. Woods" <woods%planix.ca@localhost> wrote:

> One can do email submission directly to port#25 using plain (and/or
> enhanced) SMTP, but the separation of concerns for various networking
> policies one may need to implement make it much easier to use a separate
> port.

OK thanks. This is pretty much what many articles on the Internet tend
to say, with heavy emphasis on ISPs trying to block spam on port 25, as
the main reason.

I have several books on Postfix but they were published 20 years ago
and I think at that time everything was done on port 25. It is
surprisingly difficult to find newly published books on email
architecture. I found this one recently:
https://www.tiltedwindmillpress.com/product/ryoms-ebook/