Sent emails : acknowledgement of receipt

[Nicolas Micoud]

Hi,

A customer ask me to implement on sent email a notification when the email is read (recipient can choose Ignore/Notify)

In EMail.send(), aroud line 340, I just add :

m_msg.setHeader("Disposition-Notification-To", "<my_email@my_domain>");

And it was ok.

Wondering if it could be useful in trunk.

And what should be added ? 

Perhaps a checkbox on AD_User 'IsAskForAcknowledgement' and another one on WEmailDialog.

WDYT ?

Nicolas