Now i am using zammad 2.4.x. problems with the upgrade process are documented here
Problem Mail looks like this
Von: noreply@domain.de noreply@domain.de
Gesendet: Freitag, 4. Mai 2018 12:27
An: Ticket
Betreff: Event 2546 Problem: Test CPU <5asdasdas
Problem started at 12:27:19 on 2018.05.04
Problem name: Test CPU <5test
Host: HOSTNAME
Severity: High
Original problem ID: 2546
ACK Mail looks like this
Von: noreply@domain.de noreply@domain.de
Gesendet: Freitag, 4. Mai 2018 12:30
An: Ticket
Betreff: 2546 Acknowledged: Test CPU <5asdasdas
Zabbix Administrator (Admin) acknowledged problem at 2018.05.04 12:30:15 with the following message:
Testnachricht ACK
Current problem status is PROBLEM
Resolved mail looks similar.
The zabbix Event ID is the first number in the subject. I can edit this if needed.