I have been using Roundcube 1.2.5 on Windows/IIS, it was working fine for about a year then suddenly I am getting the following behaviour:
I can send a very short email eg 4/5 lines long. If I go anything over that it just says "Sending Message", hangs and doesn't send the mail. In order to reply or forward I have to remove all previous content and keep my emails short.
Any help gratefully received.