Read Receipts are now available in Gmail for Google Apps users only, and can be enabled by the domain administrator. Read receipts allow senders to monitor the status of the messages they send and allow recipients to acknowledge receipt of mail.

Administrators can choose whether users need to manually approve receipts or whether receipts can be sent automatically. Automatic receipts can only be sent to users within the same domain and to a list of email addresses defined by the administrator.

Release track:
Rapid & Scheduled

Editions included:
Google Apps for Business and Government

Languages included:
Control Panel: US English Only (Next Generation)
Gmail: All languages supported by Gmail

How to access what's new:
- In the Administrator Control Panel, go to ‘Settings’ and then ‘Email’ to see the new feature in the section ‘Email Read Receipts’.
- Here Admins can specify which senders their users can return receipts to. The default is ‘Do not allow email receipts to be sent’, which disables both requesting and returning read receipts. For a full description of the possible options, please see the Help Center.

Note: Please do not rely on read receipts for certifying mail delivery. Although read receipts generally work across email systems, you may sometimes get a receipt for an unread message or not get a receipt even though the recipient has read the message.

For more information:
http://googleenterprise.blogspot.com/2011/07/keep-tabs-on-your-email-with-read.html
Help Center: http://www.google.com/support/a/bin/answer.py?answer=1383374

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