==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.8.6
- Linux/BSD distribution name and version: RH6
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP - Active Directory
- Web server (Apache or Nginx): Apache
- Manage mail accounts with iRedAdmin-Pro? - no - AD managed
- Related log if you're reporting an issue:
====
Hello,
Outlook has a functionality to send email "on behalf" of someone.
It changes from header.
Is there any way to block it system-wide?
I have sender_login_mismatch enabled but outlook still manages to send email with spoofed header.
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How to disable outlook "send as/on behalf" funcionality
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