I get the following error:
Aug 06 11:38:39 linux-7sfh.site echo[12299]: Starting mail service (Postfix)
Aug 06 11:38:39 linux-7sfh.site postfix/master[12384]: daemon started -- version 2.11.3, configuration /etc/postfix
Aug 06 11:38:39 linux-7sfh.site postfix/qmgr[12386]: D4840E089A: from=<karl.mistelberger@****.de>, size=449, nrcpt=1 (queue active)
Aug 06 11:38:39 linux-7sfh.site systemd[1]: Started Postfix Mail Transport Agent.
Aug 06 11:38:39 linux-7sfh.site postfix/smtp[12394]: fatal: unknown service: smtp/tcp
Aug 06 11:38:40 linux-7sfh.site postfix/qmgr[12386]: warning: private/smtp socket: malformed response
Aug 06 11:38:40 linux-7sfh.site postfix/master[12384]: warning: process /usr/lib/postfix/smtp pid 12394 exit status 1
Aug 06 11:38:40 linux-7sfh.site postfix/master[12384]: warning: /usr/lib/postfix/smtp: bad command startup -- throttling
Aug 06 11:38:40 linux-7sfh.site postfix/qmgr[12386]: warning: transport smtp failure -- see a previous warning/fatal/panic logfile record for the problem description
Any idea?