To make Mac OS X Mail request a read receipt for every message you send:


Open Terminal and run the following command:

defaults read com.apple.mail UserHeaders

If that command returns


  The domain/default pair of (com.apple.mail, UserHeaders) does not exist


run the following replacing Name with your name and email@address with your email address

defaults write com.apple.mail UserHeaders '{"Disposition-Notification-To" = "Name &lt;email@address&gt;"; }'


For example, the complete line could read

defaults write com.apple.mail UserHeaders '{"Disposition-Notification-To" = "Heinz Tschabitscher &lt;sender@example.com&gt;"; }'"

If the "defaults read" command above returns a line of values that starts with { and ends in }:


Highlight the entire line. It might read something like {Bcc = "bcc@example.com"; }, for example.
Press Command-C.
Type defaults write com.apple.mail UserHeaders '
Press Command-V.
Type '.
Insert "Disposition-Notification-To" = "Name &lt;email@address&gt;"; in front of the closing } character, replacing Name with your name and email@address with your email address.

For example, the line might now read

defaults write com.apple.mail UserHeaders '{Bcc = "bcc@example.com"; "Disposition-Notification-To" = "Heinz Tschabitscher &lt;sender@example.com&gt;"; }'

Press Enter.



How do I request a read receipt when sending e-mail with Outlook for Mac 2011?
At Heathrow, after collecting your baggage, there are three exits.


  Green - nothing to declare
  
  Red - something to declare (not sure of text)
  
  Blue - arrivals from the EU


What is the blue one for? Is it if you have something to declare, and have come from an EU country? I saw no signage to tell me when I was there last week.
