So, about 1 out of 100 times when I hit "Send", my computer hangs for a while, and then says "Resource not avaiable" at the smtp server. Who knows what the problem is--the problem is rare, and always resolves itself within 1 minute.
HOWEVER, there is an annoying bug in Powermail that hasn't been stomped on in at least the last 2 years. When a piece of mail fails to go out for whatever reason, it sits there in the Out Tray, marked "Waiting"--but it really isn't pending. The mail will just sit there, and you can queue mail and send that mail while the failed mail doesn't go out. There are two bugs here. First, when mail doesn't go out, Powermail shouldn't silently leave it in the Out Tray. I suggest that if mail doesn't go out for whatever reason, Powermail should put up a dialog saying "Mail failed to send. Queue for retry later?" with buttons "OK" "No" and "Retry now". Second, Powermail shouldn't mark mail in two different states--pending and failed--with the same label: "Waiting". It is very unintuitive that the way to get your mail to go out is to change the state from "Waiting" to "Draft" and then from "Draft" to "Waiting". Mail that has failed to go out should be marked as "Failed." I have had mail sit in my outbox for days until I found it there, "Waiting" but not going out when I hit "Send". Alan

