Gmail supports this feature- it's a "good thing" to do!

Google's instructions

• https://support.google.com/mail/answer/22370?hl=en&ref_topic=3395757

Google's write-up on this feature, which can help you confirm this is indeed what you want.

• http://gmailblog.blogspot.com/2009/07/send-mail-from-another-address-without.html

As Google writes at the above web page:

========================

• 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. Most email programs just display the "From" address and not the "Sender" field, but some (including versions of Microsoft Outlook) show these messages as coming "From username@gmail.com On Behalf Of customaddress@mydomain.com" which really annoyed people.

We heard your request for another option that wouldn't show the "on behalf of" text loud and clear, and now there's a new option that does just that. Instead of using Gmail's servers to send the message, we'll use the servers where your other email address lives. Since Gmail isn't the originating domain, we don't have to include "Sender" info in the header. No more "on behalf of."

========================

Cornell-specific details

Server to use is:

• authusersmtp.mail.cornell.edu

Use this within Gmails's Settings (upper-right) => Accounts and Import => Send mail as:.

Select to use:

• TLS

Verify access, if asked to do so. That's it!

NOTE: When you leave Cornell, this service no longer works. Even if you still get Cornell email, such as via Cmail or email forwarding.