It would be good if it were possible to modify the wordwrap behaviour of emails.
For example, one of the third party sms blocks sends email using email_to_user():
SMS messages are getting truncated to 75 chars as the word wrap feature wraps the mail and the second line gets ignored according to the clickatell API.
A patch is attached which adds some missing @param comments and adds $wordwrapwidth as an optional parameter with default 79.
This should (I hope) leave the current behaviour unchanged but allow a caller to specify the wrap width.