What is Return-Path?
The Return-Path is the address where bounces and other email feedback are sent. It is specified by the Return-Path
header in an email. For example, the default Return-Path for emails sent through Postmark is:
Return-Path: <pm_bounces@pm.mtasv.net>
It is also described as:
- bounce address
- reverse path
- envelope from
- MAIL FROM
Why set a custom Return-Path?
DMARC requires the domains in the Return-Path and From headers to match in order for the SPF check to pass. Many email providers will set the Return-Path for you, so it’s common for the Return-Path and From domains not to match and therefore DMARC will not be aligned.