Hello there We have read the message We try to help

Hello, the question to you would be what version of Thunderbird are you using? And which computer?

You could check the SMTP settings.

Can you send me which one you have for receiving and sending this?

Greetings

Hello there

Once you have installed the program, check whether other parties are blocking your traffic from receiving messages. This concerns your VPN software or Antivirus Software. Try to disable this and see if mail can now be received. After this, turn it on again for normal use. If you turn it off, see if you receive mail, then turn it on again and see if you now receive mail.

Greetings

Hello there

Also check your file folders to see if you have lost any Imap folders if you used them.

Greetings Firefox volunteer

Hello there

Your ISP has installed Spam filters, which can monitor your activities by keeping your mail on the relevant mail server. Also try disabling this.

Greetings Firefox volunteer