Use "additionalParameters" setting in Config/email.php

[menewol]

Use this variable to set the return path for mails being sent by MISP. By default this might be username-running-misp@container_id or something else which could expose internal names, or hinder senders being informed about bounced messages.

compare with default configuration in MISP / MISP/app/Config/email.php#L51

[ondj]

Hello, this image do not use Mail transport but Smtp transport:

misp/Config/email.php

Lines 3 to 6 in bbfc89d

	class EmailConfig
	{
	public $default = [
	'transport' => 'Smtp',

So that means this parameter will not work. And I checked Smtp transport and that transport do not add Return-Path e-mail header. Can you check if yours e-mails really contain that header?