We have several jobs which share Post-Build Actions.
All jobs are MultiConfiguration Jobs.

A main job (Let's call it e.g. MyMainJob) actually acts as a template job.
The other (secondary) jobs use the Post-Build Actions from MyMainJob.

1. When the main job build fails e-mail notifications are sent properly. We see info in the console output.
2. When one of the other (secondary) jobs fails, the e-mail notifications are not sent. Nothing is shown in the console output either.

Same count for any other e-mail that's supposed to be sent (Fixed, Unstable, ...)

Relevant configuration of the email-ext is:

• Fixed Project Recipient List
• Attach Build Log: _Compress and Attach Build log
• Trigger for matrix projects: Trigger only parent job
• Triggers:
  • Failure - 1st (using default config)
  • Failure - Still (using default config)
  • Failure -> Unstable (Test Failures) (using default config)
  • Unstable (Test Failures) - 1st (using default config)
  • Unstable (Test Failures) - Still (using default config)
  • Unstable (Test Failures)/Failure -> Success (using default config)
• other settings: default config