Quite a few of you use Gmail’s custom “From:” to send messages with one of your other email addresses listed in place of your Gmail address. Since these messages are sent by Gmail’s servers but “from” a non-Gmail address, we have to include your original Gmail username in the “Sender” field of the message header to comply with mail delivery protocols and help prevent your mail from being marked as spam.
and the ‘no evil Google’ in the last paragraph says:
If you use Google Apps Premier or Education edition and would like to send mail as another address within your domain or within an aliased domain, no sweat. We do all the work behind the scenes so your original username won’t be listed in the “Sender” header, and your recipients won’t see “on behalf of.”
Isn’t this contradict each other?
Many corporate users use Gmail to deliver their business email. In such case, Gmail is no way branded and I think it is time now for Gmail to take dramatic measures penalize you from continue doing that.