Martin Gregorie  wrote:
> On Sat, 13 Jul 2019 15:46:37 +0000, A. Dumas wrote:
>> I'm thinking this must be a dependency of something you installed
>> manually.
>> I'd have to check my install but for now I think it's not likely that
>> they include an (enabled) MTA by default.
>
> It may have just crept silently in without you noticing - thats what
> happened here. I had no MTAs installed under Stretch and prior versions,
> so was somewhat surprised to see exim sitting there, quietly running.

I can't check anymore because I do have one (indeed, Exim) as a dependency
of the scheduler 'at' which I installed manually. This was from a fresh
Buster install and it only came when I installed 'at' so I stand by my
assertion. (What I meant was: something you installed *before* you
upgraded, where either that dependency wasn't there before or perhaps you
removed the old mta long ago and forgot. E.g. 'at' still works without
exim, it just skips the local mails.)

> When I found it I assumed it was there to keep RPi4 folks happy if they
> were expecting to use one as a cheap desktop Linux box.

Meh. Thunderbird or other GUI mail clients work just like their Win/Mac
counterparts: they connect to the mail server themselves so don't need or
use an MTA.

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