Some of the users prefer that once the email is sent out, the email should stay in the outbox for x number of minutes before it's processed to be actually sent out. This is mainly because it helps give a 2nd thought to the email and "correct" any mistakes made.
MS Outlook allows defining a rule that allows delaying.
Google Labs has an option to do the same so that the send can be 'undone'.
Is there any equivalent facility in Zimbra that can be turned on so that the outgoing email can be delayed to be sent out of the outbox for x minutes?