"From" email settings in Confluence UI and server.xml can be different - causing an error if they are

Sometimes, the costumer can set a different from email when setting the mail server in the Interface, and this email can be different from the one set in the server.xml

Confluence shouldn't allow this and should verify the email before saving the settings, OR it should overwrite the settings in the Interface with the ones in the server.xml file.

This would avoid confusion in that configuration part.

Failing to do so can cause this error:

Caused by: com.sun.mail.smtp.SMTPSendFailedException: 550 5.7.1 Client does not have permissions to send as this sender