On 04/15/11 12:07 PM, Florin Andrei wrote: > I'm a Thunderbird user almost since day one, but now I'm looking for > something else. For whatever reason, it doesn't work well for me - every > once in a while it becomes non-responsive (UI completely frozen for > several seconds, CPU usage goes to 100%) and I just can't afford to > waste time waiting for the email software to start working again. > I think T-bird gets locked up when its SENDING mail if the server takes too long to reply at the early stages of the protocol. that or DNS lookups take too long.