On 04/15/11 12:45 PM, Florin Andrei wrote: > On 04/15/2011 12:28 PM, John R Pierce wrote: >> 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. > At least in my case - no and no. > > It freezes randomly but pretty often, no relation to sending emails. > > The IMAP and SMTP servers are defined by IP address, not hostname. But > even if that was the case, a software that blocks the UI completely > while waiting for something in the background? Sounds like 1999 all over > again. my local SMTP server is intentionally configured to verify delivery addresses before it accepts a mail. sometimes this causes delays.