Hello there md.imailed. We have read your message.

You cannot send messages anymore.

Can you try to set your settings to 587 instead of 465. And choose for STARTTLS ?

Does this change getting you somewhere?

The other answer for your other issue. The inbox contains to many emails check or delete the mails or store them somewhere else. Or there is to many email traffic around and in you re system.

https://support.mozilla.org/en-US/kb/cannot-receive-messages

Greetings Firefox volunteer.

Thank you for replying:

    Same problem, although when I changed the settings to what you suggested, the wheel kept spinning and then got message "server timed out". Went back to original settings and still got the UID FETCH error message. As for too many inbox emails, I only have 26. I usually read my inbox messages,  answer and delete as necessary. Yes, I have folders to save emails (4 of them) but nothing in excess whatsoever. The other email account associated with this one is running 100% normal. It's just this one  with this problem. (The other one has different port assignments)  Any other suggestions out there that I may try?

Hello there again.

This server timed out error is a message because waiting too long for a server is considered an error. certain topics may come up which can then be mentioned in a pop up window or error code. It indicates a timeout error for this.

Try compact your mail and archive this mail.

Make shure that in the folder pane it is set to all. menu View /or menu button > View > Folders > All .

https://support.mozilla.org/en-US/kb/switching-folder-pane-view

With the server time out message there is a certain list to follow to check if these settings are oké.

Was there a other message with the Imap UID- fetch message? Can you send me that?

It seems that the Imap - Server that you try to connect to do not want your emails at the moment.

Wait a night over and react again it might be solved.

About repairing the inbox it could get worse. So reinstallation of the Thunderbird Software option is getting closer. Check at the same time for duplicated items or software.

Use a cleaner before restart up of it.

Greetings Firefox volunteer.

Hello there again.

for some reasons it has something to do with your antivirus software.

There were no changes before this error, what was described is that editing and or disabling your anti virus program made certain parts work again.

maybe you should give this a try? Or change the software for security. Also a update for some software could be present on your system that might be the clue.

Same issues did appear as in your message issues. Seems like to be a bug. But the options to fix the situation could be there. But at a minimum or non.

For some reason it could be that your antivirus is messing up your incoming email. There is a to big request for mail what causes this error.

Otherwise try to clean the pc and backup with extern device like usb storage. Then reinstall Thunderbird Software.

Here you ve got a new fresh install Software link for you’re pc. https://www.thunderbird.net/en-US/thunderbird/102.1.2/releasenotes/ From us.

Greetings Firefox volunteer.

When I changed my IMAP settings from 465 to 587 and my connection security from SSL/TLS to STARTTLS, that is when I got the timeout error as the wheel kept spinning and spinning. Went back to the original settings and it came back with the UID FETCH failed error message again. Folder settings are set to ALL, and I can see and open Draft, Sent, Junk, Deleted + 3 other folder I put in with no problem. Only on the INBOX when clicked, that this error happens and no mail has come in now for almost a week. I can send out emails from this account, just not receive any. Usually this desktop runs 24/7, but made sure for 2 days in a row to shut it down completely. In checking my anti-virus software, there have been no detections of any virus' blocked, removed or patched applications. There was no new software, apps or anything else updated or installed on this desktop for at least 60 days. This problem started when I was still using Thunderbird version 91.12.0, so that is when I updated to version 102.1.2 (64 bit). It still has the same problem. Other emails I have are in Google and Yahoo with absolutely no issues. Just this one email account (of 2) that uses Thunderbird.

Another note as I am going over replies from all that are tying to help me resolve this issue. On one reply, it says I cannot send messages. That is incorrect, as I can write a send a message and it get received with no problem. It is just the DISPLAYING of what comes into my inbox. So when this started last week, there were 26 messages. As the week went on, my INBOX keeps getting more and more mail. Today, it's at 69 messages. I can read each and every folder, just not the INBOX one. I then went to my host (Optimum.net) and was able to read all INBOX mail, as well as my folders and SENT, DELETE & JUNK mail. I can do all functions within Thunderbird like delete the old emails and junk. It's just the reading of the INBOX that is the problem. Somehow it is getting the emails, it's just not letting me read them?

Just a side comment here: the UID Fetch fail can be a problem in the server, not necessarily the email client receiving the message. That would be my first guess here.

So I assume that means I should contact Optimum and go to their troubleshooting problems or use their support team? (This is what me, this novice thinks, I should do when you say the "problem can be in the server")

Hello there again.

https://support.mozilla.org/nl/questions/1386455#answer-1527753

Greetings Firefox volunteer.

Although I'm having fits getting connected to Optimum, one thing I learned about IMAP over POP3, is that the data/messages remain on the server. This frustrates me as I had always used POP3 before. So if you go to web mail and open the messages, they now show as "read". In order for TB to see them, you need to re-mark the messages to "unread", so that TB sees them.

If anybody at TB knows how to help get me reconnected, I would sure appreciate a helping hand. At this point, I'm not sure that Optimum isn't tangled at the server. GS

Much water has crossed under the bridge since the last comment, but after many weeks of frustration with Optimum.net and getting my TB to see and download email, I finally got it worked out. My hunch is that Optimum has done some major tweaking also, because of all the hate mail and bad reviews. Most of my problems seemed to stem from having 3 different accounts of which they were internally linked at the server. The biggest help for me was to go to "Account Settings" and delete one or more accounts in TB, and then click on "Add Mail Account". After supplying the "User name", "email address", and PW, TB goes out and searches the internet for anything that might match. (And it usually does a bangup job too.) You may have to tweak the settings a little, like port numbers, security setting, etc., but I was able to get at least one "account" to work. From there, I used that information to guide me in getting the settings right in the main account where most of my mail resided. Since Optimum.net doesn't recognize POP3 or IMAP, but used just "MAIL.optimum.net", I wasn't sure whether Optimum would keep my mail on their server, or not. However, to my delight, it removed everything by downloading to TB. (Over 350 emails)

There was still just one problem. I had no way to "send" or "reply". I can't remember exactly how I figured it out, but I created another account for my ghost account for sending. Then I redirected all mail from the separate accounts into a personal "Local" folder, so I didn't have to keep checking each one separately. So far, it has been working beautifully, and I thought if I ever have a crash, I'd never be able to recreate my settings, so I carefully took "screen shots" of the Account Settings" window for EACH settings window. (Account settings, server settings, copies and folders etc.) for each account. I pasted the screen shots into a photo editor and saved them as JPGs for posterity. (About a dozen of them.)

I guess this will only be good until some new company buys out Altis/Optimum! :-(