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groups:
- name: postfix
rules:
- alert: postfix/down
expr: postfix_up != 1
for: 5m
labels:
severity: warning
annotations:
summary: Postfix is down (instance {{ $labels.instance }})
- alert: postfix/smtp-temporary-errors
expr: rate(postfix_smtpd_messages_rejected_total{code=~"^4.*"}[15m]) > 0
for: 0m
labels:
severity: warning
annotations:
summary: Postfix is rejecting messages due to errors (instance {{ $labels.instance }})
description: Postfix has seen code {{ $labels.code }} errors recently
and temporarily rejected emails.
https://en.wikipedia.org/wiki/List_of_SMTP_server_return_codes and
`sudo journalctl -xeu postfix@-` may provide more information on
the current issue.
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