Comment # 4 on bug 932163 from Andrew Beames

I am now using the leap 42.1 repos (rather than tumbleweed) but it is now a
heavily customised mail system. I call fetchmail manually, for example.

However, I have just checked
/etc/sysconfig/fetchmail

and the setting is:
FETCHMAIL_POLLING_INTERVAL="300"

but, if I start the service:
/etc/sysconfig % sudo systemctl start fetchmail

and then check:
/etc/sysconfig % sudo systemctl status fetchmail
fetchmail.service - A remote-mail retrieval utility
   Loaded: loaded (/usr/lib/systemd/system/fetchmail.service; disabled)
   Active: active (running) since Sat 2016-01-02 20:15:53 GMT; 6s ago
 Main PID: 18482 (fetchmail)
   CGroup: /system.slice/fetchmail.service
           ������18482 /usr/bin/fetchmail -d 900 -f /etc/fetchmailrc

you can see that the daemon has still been kicked off with 900.

Note that my /etc/fetchmailrc file only has poll statements in it.