Fetchmail via systemd won't become a daemon

I configured fetchmail to run at startup, via systemd.

It runs, without errors, but it exits as a "one time running" and not 
like a daemon.

In the file "/home/mf/.config/systemd/user/fetchmail.service" :

-----------------------------------------------------------------------------------------------------------------------

[Unit]
Description=A remote-mail retrieval utility
[Service]
ExecStartPre=/usr/bin/setmail
ExecStart=/usr/bin/fetchmail  -v --daemon 60  --fetchmailrc 
/home/mf/.fetchmailrc
RestartSec=1
[Install]
WantedBy=default.target

-----------------------------------------------------------------------------------------------------------------------

In the  /home/mf/.fetchmailrc :


set idfile /spazio/tmp/Logs/fetchmail-mf-uidl
defaults timeout 60
proto pop3 uidl
options fetchall
mda '/usr/bin/procmail -d %T';

I also tried adding in the ".fetchmailrc" file the option

set daemon 60

but with identical result : the fetchmail process ends with no error, 
but not persists running.


$ systemctl --user status fetchmail
○ fetchmail.service - A remote-mail retrieval utility
      Loaded: loaded (/home/mf/.config/systemd/user/fetchmail.service; 
enabled; vendor preset: disabled)
      Active: inactive (dead) since Sun 2022-05-29 18:57:00 CEST; 43min ago
     Process: 1365 ExecStartPre=/usr/bin/setmail (code=exited, 
status=0/SUCCESS)
     Process: 1572 ExecStart=/usr/bin/fetchmail -v --daemon 60 
--fetchmailrc /home/mf/.fetchmailrc (code=exited, status=0/SUCCESS)
    Main PID: 1572 (code=exited, status=0/SUCCESS)
         CPU: 14ms

mag 29 18:57:00 mfhost systemd[1311]: Starting fetchmail.service - A 
remote-mail retrieval utility...
mag 29 18:57:00 mfhost systemd[1311]: Started fetchmail.service - A 
remote-mail retrieval utility.


$ journalctl --user -xeu fetchmail.service

mag 29 18:57:00 mfhost systemd[1311]: Starting fetchmail.service - A 
remote-mail retrieval utility...
░░ Subject: L'unità UNIT inizia la fase di avvio
░░ Defined-By: systemd
░░ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
░░
░░ L'unità UNIT ha iniziato la fase di avvio.
mag 29 18:57:00 mfhost systemd[1311]: Started fetchmail.service - A 
remote-mail retrieval utility.
░░ Subject: L'unità UNIT ha terminato la fase di avvio
░░ Defined-By: systemd
░░ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
░░
░░ L'unità UNIT ha terminato la fase di avvio.
░░
░░ La fase di avvio è done.


if I run, in a terminal, as user "mf" the command:

/usr/bin/fetchmail  --fetchmailrc /home/mf/.fetchmailrc

it runs with no errors and fetches the email, normally.

Where is the problem?

Thank you for your help

-- 
*Mauro Folcarelli*
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