Why is Outlook 2007 suddenly saying on Behalf of

gmailoutlookoutlook-2007

We send emails to clients and bcc each email sent to a few mailing lists. We re using:

  • Google apps
  • From email: is in our domain

We ve been doing this for a few months now but as of 11 am ET today, Outlook users on any of the mailing lists have been seeing: "From my-mailing-list@mydomain.com on behalf of Domain Emailer".

The process that sends the email uses SMTP through Javamail.

Best Answer

In case some one is wondering why this happened. I inspected the email headers closely and found this:

Sender: my-mailing-list@mydomain.com

Google starting adding this yesterday and thats what caused Outlook to say "on behalf of" all of a sudden.

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