Make sure your syncing Thunderbird with email server, once you delete your email in thunderbird it deletes from email server also.

Are you using POP3 or IMAP?

Yes, I am using POP3. I'm wondering if there is a setting I'm missing that tells my server to erase the email there, once sent.

Right click on your email accout(at the left painel), click on settings near the bottom you will see an option Leave messages on server check the second option below, Until i delete or move them from inbox

There is a setting in Thunderbird Account Settings > Server Settings in an account to leave messages on server. Make sure that box is unchecked.

What has this got to do with Firefox? This is a Firefox forum.

Thanks! I'm sure this will fix the problem! ;)

In case anybody sees this thread, this has actually been the official forum for Thunderbird support also ever since February 21.

I have this problem too. I am IMAP. I don't see the setting to remove email from email server when i go into settings.