What version are you running?
3.0.8
Describe the enhancement and the motivation for it.
Our smtp server prevent sending mails with different sender mail (argument from_email of EmailMessage) and allow only own account for this field
Please provide any additional information below.
https://github.com/reviewboard/reviewboard/blob/dd97c294ee1bac369b2b0ee3425054db0a8f730f/reviewboard/notifications/email/message.py#L236

That line use mail of review/request user.

For now we change this line to from_email=settings.DEFAULT_FROM_EMAIL

but we want to have option for this in admin panel.