SquirrelMail Version 1.4.0
Redhad Linnux 7.1
When I get a message which requested a response,
I answer the follwing message with Ok and a debug
window opens. The message was not sended.
The message sender has requested a response to
indicate that you have read this message. Would you
like to send a receipt?
When I debug the the HTML-code, the error accours
on the call of the function sendMDN(), but I didn't
find the definition of the function in the HTML-code.