While configuring emails notifications with Email ext plugin. Trigger is set to "Failure-Any" and Send-To set to "Developers" (Tried adding Culprits as well). But mail is not sent. Message in the job log is as below -
12:24:39 Notifying upstream projects of job completion*12:24:40* Email was triggered for: Failure - Any*12:24:40* Sending email for trigger: Failure - Any*12:24:40* An attempt to send an e-mail to empty list of recipients, ignored.12:24:40 Finished: FAILURE
I have set the recipient list to blank. If I add any email id to the recipient list, the mail is sent to that person. But I do not want to explicitly configure the email IDs. Want email to be sent to the developers who have done check in or broken the current build.

Note: This was working till sometime back. After we upgraded Jenkins, we are facing the problems. This is not working for any of the build jobs now.