Messages sent from Thunderbird and other clients are often broken into 72-character lines, with format specified as "flowed", meaning the sender expects the recipient's mail reader to re-wrap the message in a way appropriate to his reader. The sending program (Thunderfird) does this by including the following in the message header:

Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

Zimbra's web interface in our installation leaves the line-breaks in (every 72 characters or less) rather than re-wrapping the message. This is OK for display but inconvenient when the user wants to cut-and-paste to another application.

Is there a way to get Zimbra to re-wrap the message and remove these line breaks?