Flag external email

[kvdb]

Summary

Feature request

I would like to be able to enable the feature of flagging external email on a per-domain basis from the mailcow email configuration graphical interface.

Motivation

I manage a mailcow installations for a few coworker accounts. Not all of them are experienced internet users so I've been looking for a way to flag external mails. So far, people checked personally on requests to transfer money to a scammer on the Internet. (https://www.kaspersky.com/blog/how-to-spot-and-prevent-boss-scams/50861/)

Exisiting solutions

Microsoft users have had this feature for a long time already

Also, another helpful mailcow user wrote a script for this.
However, I don't feel comfortable pasting forum scripts in my rspamd config that have not been code-reviewed by a core developer.

Additional context

No response

[mac-linux-free]

That is a great idea.