I created monitor rules and tried to test email function. When firing, I couldn’t get email notice. When I check /srv/logs/alertmanager.log in PMM docker. I saw error with “501 5.5.4 invalid domain name”. I posted in attachment.
And then, I telnet email server from docker host and typed “ELHO” with email address. Got the same error. I posted in attachment too.
Does this mean the “EHLO” isn’t supported by email server? If yes, is there a way to bypass “EHLO”?