There is a cryptic comment here <https://prometheus.io/docs/alerting/latest/configuration/#configuration-file> :
# The default SMTP TLS requirement. # *Note that Go does not support unencrypted connections to remote SMTP endpoints.* [ smtp_require_tls: <bool> | default = true ] What I think it means is that Go does not support unencrypted SMTP connections *with authentication*. There is more detail here: https://github.com/prometheus/alertmanager/issues/1358 In other words: if you are using smtp_auth_username and smtp_auth_password, then in effect smtp_require_tls is forced to be True. On Tuesday, 12 April 2022 at 08:50:46 UTC+1 [email protected] wrote: > In alertmanager.yml,I tried > smtp_require_tls: false in global and insecure_skip_verify: true in > receivers, > > both of them failed with: > level=error ts=2022-04-12T07:11:19.061Z > caller=dispatch.go:354 > component=dispatcher > msg="Notify for alerts failed" > default/email[0]: notify retry canceled after 8 attempts: establish TLS > connection to server: x509: certificate signed by unknown authority" > -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/ec531df7-a072-43fb-80ee-abd4966ef48en%40googlegroups.com.
