I run large mail programs sending many mails at a time. Typically there will be 2,000 emails waiting to go out in the Local Folders Outbox. There have been updates from Thunderbird, etc. My Thunderbird recently crashed and now when I click on Send Unsent Messages, instead of sending every message, it only sends the first one and then stops working all together. So I have 2,000 emails in the queue, it sends one, I have 1,999 and it stops. I repeat the process, it sends 1 and I have 1,998 left. I tried to fix this. (1) I compacted the folders in case there was a memory problem, though I used Thunderbird only as a client on that machine without any saved messages. Didn't work (2) I rebooted my machine. Didn't work (3) I cleared the cache memory. Didn't work (4) I Uninstalled and reinstalled Thunderbird. Didn't work. (5) I tried resetting settings in the config file. Didn't work. I am wondering if the issue is parameter in the config file and somehow it was reset from send all to send one in the unsent queue. Please help, this is not a simple problem but maybe there is a simple answer in the config file.