Custom email bounce back message3/29/2023 ![]() ![]() When the Return-Path domain is set up and emails are sent from, the domains are aligned for DMARC to operate. If the path doesn’t match your “From” address, those emails will fail DMARC’s SPF alignment authentication.įor instance, if your company sends email from, you can still pass SPF and DKIM authentication however, because the Return-Path and “From” addresses aren’t using the same domain, SPF won’t pass for DMARC verification. DMARC checks the Return-Path of a message to confirm that domain matches the domain in your “From” address. Moreover, if you have a DMARC policy implemented for your domain, setting up a custom Return-Path to achieve SPF alignment is strongly advised. ![]() Now what does that mean? Basically, it means that the domain present in the Return-Path must match the domain found in the FROM address (the one you will see in a inbox when reading an email).Īlthough a custom Return-Path isn’t required, it has many advantages. ![]() This test is part of DMARC, where by a message must either pass both SPF Authentication and Alignment tests or pass both DKIM Authentication and Alignment tests to be considered DMARC Compliant. The return path also becomes critical to passing the SPF Alignment test. If it fails, the message is indicative of spam. If it matches, the email will pass SPF authentication. The recipient email server will take that list and compare it to the IP address that sent the message. When it retrieves the record, the record will contain a list of approved IP addresses that are allowed to send email for the domain part of the Return-Path address. With regard to SPF, the Return-Path (in addition to being the email address that recipient email servers use to notify the sender of delivery problems (bounces)) is the address that the email server uses to get a SPF Record (TXT DNS record). (For this write-up, we’ll stick with Return-Path.) How does the Return-Path apply to SPF In addition to the Return-Path moniker, there are several variants of the name, including bounce address, reverse path, envelope from, envelope sender, return address, and MAIL FROM. So, if an outbound email can’t be delivered, it’ll end up at the Return-Path, which is specified by the Return-Path header in an email and invisible to other parties. Return-Path Address & How does it apply to SPF?Ī Return-Path is the designated email address where bounced messages and other email feedback are sent. ![]()
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