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I was wondering whether Mail.app is able to send read receipts (or maybe it does silently?) or create emails that require those?

I know such a feature is available in Outlook.

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2 Answers 2

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I tested this using Mail on Snow Leopard connected to Exchange 2005.

There is no ability to set a request to receive read receipts.

Reading an email sent from Outlook in Windows to mail on Snow Leopard with a read recipt requested, does not send a read receipt.

Lion may vary.

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I have tested with newer Exchange servers on Lion and it seems to be consistent across the range - Mail.app neither request nor sends back read receipts. –  Michal M Mar 21 '12 at 9:36

Mail.app can be told to ask for read receipts, you can use Mail Receipt to set up the required custom headers:

Screen shot of Miln Mail Request

How Read Receipts work

To ask for a read receipt an additional header needs to be added to your outgoing e-mails. Mail.app supports custom headers through a default called UserHeaders.

When changing defaults, be sure to quit Mail.app before altering the default. Afterwards relaunch Mail.app and test any changes.

Setting a Read Receipt Header

Customise and use the following Terminal.app command to set a Disposition-Notification-To header:

defaults write com.apple.mail UserHeaders '{"Disposition-Notification-To" = "YOUR NAME <YOUR@EMAILADDRESS.COM>"; }'

Removing Custom Headers

To stop asking for read receipts, delete the UserHeaders preferences with the command:

defaults delete com.apple.mail UserHeaders
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However any other mail app can refuse to respond to the notification request so you cannot rely on it (e.g. I would always tun it off as I would only reply if I read it also I know of people with 100s unread email so receipt is not a useful criteria) –  Mark Jan 22 at 17:44

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