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

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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!

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!

Dyrbiće so pola swojeho konta přizjewić, zo byšće na přinoški wotmołwił. Prošu stajće nowe prašenje, jeli hišće wužiwarske konto nimaće.