The problem is that JIRA 3.0 tries to add the name of a user that did the change to cause the notification to the "from" address. JIRA does this by simply surrounding the the from address with "<" and ">" and prepending the username. If the from address already has the username then the result is "username" <xxxx <address>> which is not valid. Need to check the format of the from address and if it has a username part do not blindly surround it with "<" and ">" but maybe just prepend "username -", so the result wound be "username - xxxx" <address>.