Send mail from another address without "on behalf of" Posted by Emmanuel Pellereau, Software Engineer 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. 11 Power Tips for Gmail. Update: Here’s one more bonus tip.
Use the ‘m’ key to mute a conversation. Suppose you’re on a mailing list and you don’t care about what’s being discussed. Tips.