OSX 10.15.7

Do you have "save a copy of sent messages on server" set up in your settings?

I have that setting, and it takes about twenty seconds to complete the sending and copying to the Sent Mail folder on my server.

Thank you for your reply

This is an IMAP and saves to the sent folder. Then synced.

But it was like this for ages. And it was very quick. since a few days, as mentioned above, the «sending message» dialog stays on for 20 seconds. Minimum.

I'm not absolutely sure, but I strongly suspect that Thunderbird is not at fault here. It's much more likely that your mail server is at fault. TB is, after all, just software files on your computer. They all work together to make your experience as solid as it can be. In most cases, their work together is highly successful.

If TB were at fault in your slow outgoing mail phenomenon, there would be a slew of complaints on the Internet about it, I see none but yours.

If this continues to happen for a few more send-mail operations, it's remotely possible that a re-installation of TBird would help, but I doubt it. (Uninstalling doesn't take away your 102 profiles. Re-installing will give you back your profiles and some new operating files, though.)

If the lag goes away sometime soon (on its own) we'll have a tiny bit of evidence that TB was not at fault.

Have you tried 115 yet? So long as you choose a custom installation and put it in a folder that's different from the default folder, you can run both 102 and 115 at the same time, and that might be revealing (i.e., if mail goes out faster in 115 than in 102, TB 102 may be at fault; if they are about the same speed, it's not your 102 that's at fault.). I'm running them both at the same time right now, and using a side-by-side comparison to help me get 115 configured roughly the way I have 102 configured, with the exception of some of the great new features of 115.

As mentioned, this is not a server nor network issue. I tested on another client on the same computer and everything is very quick. Instantaneous.

Also, note that I did not experience this until recently, and it is like this still today. And none of my employees using the same server and domain don't experience this.

I click send and then I have a dialog, and sometimes a Spinning Beach Ball (Mac). Sometimes it takes more than 20 seconds. I could try to reinstall but not my pref as I will have settings to redo etc. for sure.

So my questions are: 1-Is there a way to see the whole stream of communication with the SMTP server? kind of a VERBOSE mode of the transaction so I can see exactly WHERE this is stalling? I'd like to see more info that a simple dialog. 2-Is there an easy way to roll back to 102.12.0 ? Mac OSX

Thank you

You might try logging the connection. use the config editor to change the setting mailnews.smtp.loglevel, to All This will log everything to the error console (ctrl+Shift+J)

Note that clearing the console by pressing the trash button and then trying your send will result in less noise in the log.

You can right click in the console and use save all message to a file to make a copy of the log that you can examine at your leisure, or post.

PS verbose logging remains active until you disable it again in the config editor.

Thanks for your reply. Attached is a capture of my error console while sending. That one was only 7 seconds... but still quite long waiting for a dialog. Sometimes it is 20-40 seconds. Sending through Gmail or my own SMTP server has the same delay. So this is not server side issues. Once sent, saving to sent folder is instantaneous in the dialog.

PS: Was there a change in the way Thunderbird handles sending lately? I mean maybe it always took that time but the dialog was closing right away in a previous version? Dunno, just asking, because this is new in my over 8 years TB experience. Thanks again!