How to specify Return-Path

Dear Takayuki,

Our server requires that we specify the Return-Path in order to ensure accurate and consistent delivery of emails and not be caught as spam.

This was raised 9 years ago on this post: https://www.ads-software.com/support/topic/adding-return-path-header/

You commented that the correct syntax is:
Return-Path: <[email protected]>

However, even though I have added this to the ‘Additional headers’ section of the form, it isn’t having any effect on the Return-Path in the email header.

Please can you advise why this is no longer working and what can be done to get it working again?

Thank you.

Rob