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Topic: Feature in received if an Email Was Transmitted Using TLS Encryption?

==== Required information ====
- iRedMail version (check /etc/iredmail-release): 9.4
- Linux/BSD distribution name and version: Debian
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx):Nginx
- Manage mail accounts with iRedAdmin-Pro?
- Related log if you're reporting an issue:
====

How Can You Tell if an Email Was Transmitted Using TLS Encryption?
You can check in logs, but how about to make it possible to see in every email?

I am talking about the sender’s email or WebMail server talks to the recipient’s inbound email server and transmits the message to them over TLS secured channel or not.

This type of information now available receiving in

gmail  example:
(version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);

or

hotmail
example: Received: from myIredmailServer ([46.101.xxx.xxx]) by BAY004-MC3F32.hotmail.com over TLS secured channel with Microsoft SMTPSVC(7.5.7601.23143);

It would be a great feature in iredmail. How to make it happen?

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Re: Feature in received if an Email Was Transmitted Using TLS Encryption?

With Postfix settings below, it will log TLS transition info in log file:

smtp_tls_loglevel = 1
smtpd_tls_loglevel = 1

To add related mail header, please set:

smtpd_tls_received_header = yes