
One fine day, an email comes from the client stating that emails from Jenkins were not coming at all. Well, that’s strange…
The Diagnosis
I like troubleshooting quite a lot and the rule of thumb is to first ask what changed? While the initial diagnosis was going on, the client mentioned that their network team made upgrades to the mail server and now only TLSv1.2 & TLSv1.1 were supported. Earlier, Jenkins sent email using SSL. (Yep, you guessed it right…using the -Dmail.smtp.starttls.enable=true parameter
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