Security Bar/Header Text

[emresaracoglu]

Summary

Hello,

Is it possible to add a "sent from outside secure addresses" or another text.. warning in the header of emails sent from domains other than certain domains?

Thank you

Motivation

If this feature is not available (I couldn't find it), I think it would add more value both in terms of security and a new feature to Mailcow features.

Additional context

No response