Jenkins email notification is successfully sent but not received
When I run test emails from the Jenkins configuration page they are reported as "successfully sent" but only sporadically arrive (sometimes after a long delay) to internal company email. When I change the test email to send to an external (gmail) account it is immediately received.
I am using the company smtp mail server. I am able to telnet to it from Jenkins master and successfully send internal emails that way.
Jobs notification emails never arrive even though Jenkins reports it as:
Email was triggered for: Success
Sending email for trigger: Success
Sending email to: <MY EMAIL>
I couldn't find anything in the jenkins.log (but maybe I need to look at a different log?). Any help with troubleshooting the root cause would be great.
Look at your SMTP server log to see if it queued the request and ensure it isn't stuck in a queue or dead message. It will also log if a SPAM or policy issue is causing the inconsistency.
Answering my own question: I overlooked the SMTP settings in manage Jenkins page for the Extended E-Mail Notification plugin. It was only set for E-Mail Notification