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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

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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:Use

• TLS

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