Hi,

I have noticed that notifications like mentioning somebody generates mail, where "from" field is different than it is set up in confluence mail server configuration.

Confluence mail server configuration example:
"From Address" -> confluence-administrator@example-company.com
"From Name" -> ${fullname} (Confluence)

Generated mail notification by mentioning somebody:
"From" -> Joe Bloggs (Confluence) <Joe-Blogss@example-company.com>

According to documentation it should be:
"From" -> Joe Bloggs (Confluence) <confluence-administrator@example-company.com>

This issue doesn't occur when page is shared.

Depending on mail server configuration in company infrastructure, that bug generates following error in confluence logs:
com.sun.mail.smtp.SMTPSendFailedException: 550 5.7.1 Client does not have permissions to send as this sender

Regards,
Wojciech Ośródka