Installed postfix and fetchmail. However what worked for decades now fails:

Code:
Nov 27 17:09:29 burgberg systemd[1]: Started A remote-mail retrieval utility.
Nov 27 17:09:30 burgberg fetchmail[1511]: starting fetchmail 6.3.26 daemon
Nov 27 17:09:31 burgberg fetchmail[1511]: Query status=10 (SMTP)
Nov 27 17:10:31 burgberg fetchmail[1511]: 6 messages for roland.....@gmx.de at pop.gmx.net (115863 octets).
Nov 27 17:20:31 burgberg fetchmail[1511]: reading message roland.....@gmx.de@pop.gmx.net:1 of 6 (95429 octets) (log message incomplete)
Nov 27 17:20:31 burgberg fetchmail[1511]: SMTP connect to localhost failed
Nov 27 17:20:31 burgberg fetchmail[1511]: SMTP transaction error while fetching from roland.....@gmx.de@pop.gmx.net and delivering to SMTP host localhost
Any idea?