How do I remove the “Sent on behalf of” header?


When sending your campaigns, you may find that an additional header is added to the top of your outgoing messages. In Outlook, the "From" area will show the name of your account with us, the domain name of the mail server that sent the message, the words "sent on behalf of," and your specific "From" email address. In Gmail, there is a similar message, although the wording is slightly different:


Why does this header exist?

  DKIM and DMARC authentication is required beginning February 2024 following upcoming changes by Gmail and Yahoo regarding authentication requirements. ActiveCampaign highly recommends all senders set up DKIM and DMARC. Learn how to set up DKIM and DMARC authentication.

For more information on these changes see our blog post A Guide to Google and Yahoo authentication Changes in 2024.

This occurs if you have not set up DKIM for your sending domain. If you have set up DKIM and are still seeing this header, it means your DKIM records are not set up correctly, and you should take action immediately. In ActiveCampaign, you set up DKIM when you set up your sending domain. Learn how to set up your sending domain.

Outlook and Gmail display a header message to tell recipients that DKIM was not set up for the domain being used in the From Address (your domain) because this can sometimes indicate a message has been "spoofed" or "faked."

Not only is this ugly "via" header highly undesirable, but removing the header is straightforward, with no negative consequences.

Learn more about DKIM and email authentication

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