A much desired feature of email read receipts is now available in Google Apps for Business and Government editions. This feature was possible where Gmail has control over the mails and Google Apps was the right place to for.
In business we often want to know the status of mail we have sent. With this we will be able to receive acknowledgement receipt of our mails.
How this thing will work for the mails send to Groups and how effectively it can be used will have to be seen as of now.
According to Google,
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.
More information can be found at: http://googleappsupdates.blogspot.com/2011/07/want-to-keep-tabs-on-that-email-you.html
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.