Sorry for my lack of knowledge. Still I think that RT, to be more precise, Email::Address:List module should reject this kind of header and not stuck in infinity regex loop.
What I was able to get from mail sender, he was using Microsoft Outlook Web App. -- View this message in context: http://requesttracker.8502.n7.nabble.com/REST-mail-gateway-using-100-cpu-tp56255p56358.html Sent from the Request Tracker - User mailing list archive at Nabble.com.
