Thunderbird 128.2.3esr (64-bit) Sending of username did not succeed. Mail server responded: invalid command

Hi your all, I have used Thurderbird more than 6 years and it was really good for me without any complaints. However, I updated the email from Supernova to Nebular (128.… (kàsi)

Hi your all,

I have used Thurderbird more than 6 years and it was really good for me without any complaints. However, I updated the email from Supernova to Nebular (128.2.3esr (64-bit) yesterday and I got the following message and I cannot receive any emails now. Fortunately, sending is no problem.

"Sending of username did not succeed. Mail server pop3.mailplug.co.kr responded: invalid command"

I searched the previous similar issues in the forum and I checked my status. However my own was the right one that people recommend.

Receiving Server: pop3.mailplug.co.kr / Port: 995 / SSL/TLS / Normal password Sending Server: smtp.mailplug.co.kr / Port: 465 / SSL/TLS / Normal password

Actually, I am using several pop email apps but I have no any issues on those apps except for the Thunderbird. The problem is Thunderbird is my main app. I am alternatively using outlook but really want to return to Thunderbird. Could you anyone help me out?

Thank you for your kindness in advance!

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Hey There,

Hope everyone is doing great!

The body search feature is missing in my Thunderbird. Searching for any text that I know appears in a body also returns no results. How do I enable this?

Please let me know if it's a setting that prevents this option from showing up. ( Just a thought, if it is some setting, could it be grayed out instead with a tool tip text to show why it's grayed out instead of removing the option completely? )

Cheers, Tom

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Hi I'm running version 128.4.3esr. To prevent my inbox becoming very large I have created a folder called Archive and several subfolders such as 2021, 2022, 2023 etc. E… (kàsi)

Hi I'm running version 128.4.3esr.

To prevent my inbox becoming very large I have created a folder called Archive and several subfolders such as 2021, 2022, 2023 etc.

Every few months I move old files from an earlier year into its appropriate subfolders.

I've been doing this for at least 10 years. When a folder is about 5 years old it is deleted.

My problem is that today I'm unable to move emails from my inbox to an appropriate subfolder. I get no response. It simply doesn't work as it used to.

Any suggestions gratefully accepted

Peter Moran

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I already tried putting Thunderbird as a shortcut into the C:\Users\<myAccountName>\AppData\Roaming\Microsoft\Windows\SendTo (aka. shell:SendTo) folder. But when I use the "Sent to" menu and select Thunderbird, the file to be attached just gets openned by Windows as if I had double-clicked on it. Thunderbird does not even open a new message.

I also tried changing the call of the Thunderbird shortcut in the SendTo folder to: "C:\Program Files\Mozilla Thunderbird\thunderbird.exe" -compose attachment= At least, then Thunderbird opens a new message. But it just writes the path\filename of the file to attach into the attachment section. When I then try to send the message, Thunderbird says it cannot access it under this path.

How are you doing this? Thanks!

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Whatever I press it goes to another screen and says: 400. That’s an error. The server cannot process the request because it is malformed. It should not be retried. That’s all we know.

The email address did work OK for months and I just don't know how to get it back. I've tried to delete the account and then reinstall it but that hasn't worked. My other email addresses are still working fine. I can still access the faulty address directly on Google Mail so I know it still should work. It's possible I have changed the password in the google account. I have tried this password in Thunderbird but to no effect. Is there a way to reinstall the faulty address? Help! Any help would be greatly appreciated.

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Thunderbird has to be reset every time it opens.

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I get this message when I attempt to send an email


Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: resomta-a2p-646770.sys.comcast.net resomta-a2p-646770.sys.comcast.net Excessive failed authentication, ESMTP server temporarily not available.

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In Thunderbird I've set the font size (interface) to 12 and in Settings the default font sizes for Latin and Other Writing Systems to 12 (both) and finally the interface font as well as plain text email and HTML e-mails without font sizes specified explicitly look natively and perfectly.

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