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Email - de-duplication in Gmail, G Suite for Domains, and xMail

This article explains the concept of de-duplication within email systems. Under certain circumstances in Gmail, G Suite for Domains (formerly known as Google Apps), and Exchange, mail is de-duplicated resulting in recipients only receiving one copy of a message sent to the recipient multiple times, or recipients not receiving messages sent via uchicago.edu to their Google accounts.

Gmail and G Suite for Domains

If a user forwards their uchicago.edu mail to a gmail.com or G Suite for Domains example.com and then tries to send a message from Gmail/G Suite to their uchicago.edu address, they will never receive it in their Gmail/G Suite inbox. Google has message de-duplication as documented here:

http://support.google.com/mail/bin/answer.py?hl=en&answer=6588

This also happens if a user sends to @lists.uchicago.edu address from Gmail/G Suite for Domains. If the user is a subscriber to the @lists.uchicago.edu address, she will never receive the message as distributed by the lists.uchicago.edu server.

Example:

Bob@gmail.com, is a subscriber to fakelist1@lists.uchicago.edu. Bob sends a message to fakelist1@lists.uchicago.edu. Bob will never see the distributed message from fakelist1@lists.uchicago.edu in the Gmail inbox.

Example:

Bob, bob@uchicago.edu, forwards their mail to their private Gmail account, bob@gmail.com. Bob sends a message from Gmail to their uchicago.edu account, bob@uchicago.edu, to test if mail forwarding works. Bob will never see the message in the Gmail inbox.

xMail

If an xMail user is a subscriber of two @lists.uchicago.edu address and a single message is sent to both lists, the xMail user will only receive one copy of the distributed message.

Example:

Bob, an xMail user, is a subscriber for fakelist1@lists.uchicago.edu and fakelist2@lists.uchicago.edu. Sally sends a message To: fakelist1@lists.uchicago.edu and Cc: fakelist2@lists.uchicago.edu. Bob will receive this message once, and it may appear to come from either fakelist1@lists.uchicago.edu or fakelist2@lists.uchicago.edu.




Keywords:mail de-dupe xmail lists.uchicago.edu GoogleApps google apps gsuite   Doc ID:21893
Owner:Paul B.Group:University of Chicago
Created:2011-12-21 10:42 CSTUpdated:2016-11-07 16:35 CST
Sites:University of Chicago, University of Chicago - Sandbox
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