Why can some emails display as “on behalf of” or “via”?

Starting in February 2024, Gmail and Yahoo are rolling up new authentication requirements which require using a custom DKIM authenticated domain with DMARC reinforced.

GetResponse strongly advises all senders to use emails addresses from own sending domains as a from field, and to configure both DKIM and DMARC.

For additional details on these modifications, refer to our blog post:
Gmail and Yahoo’s Authentication Changes: All You Need to Know

Regardless of your ‘From’ address settings which you choose for each message, it may happen that some of your subscribers see:

From: [xyz@getresponse-mail.com] on behalf of [your_from_email]

-OR-

From: John Smith [your_from_email] via getresponse.com

The situation described above may occur for only some of your subscribers using certain email clients and email applications like Gmail and Outlook. To avoid this, you would need to set up a DKIM signature for your sending domain. This manual will provide instructions on how to set that up.