What is the difference between the Mail From (MFrom) address and the From address?

The key differences between the Mail From (MFrom) address and the From address include:

  • The sending domain of the From address might not be the same as the Mail From (MFrom) domain depending on your sending practices. 
  • During authentication, Sender Policy Framework (SPF) checks the domain in the MFrom address, not the From address domain.
  • Both addresses can be found in separate locations in the email header, as shown in an example below.

The MFrom address is also referred to as the Return-Path address, Envelope-Sender address, and the bounce address.  

Header Example

X-Apparently-To:; Wed, 20 Jan 2016 11:11:10 +0000
Return-Path: <>
Received-SPF: pass (domain of designates as permitted sender)
MIME-Version: 1.0
Content-Disposition: inline
Content-Transfer-Encoding: binary
Content-Type: text/html; charset=utf-8
X-Mailer: MIME::Lite 3.027 (F2.74; A2.03; B3.07; Q3.07)
Date: Wed, 20 Jan 2016 04:11:09 -0700
From: Return Path Monitor <>
Reply-To: Return Path Monitor <>
Subject: Here's why your mail is getting filtered...
X-Rpaspmid: 1453288262
X-Rptags: Newsletter 1453288262
Message-Id: <>
Content-Length: 14716

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