Hello there Emiliesc We have read your message. We try to help you. It seems that you are having recieved this error code. This error codes seems not to excist. Can you send me a screenshot of this? How is the situation at the moment? Can you explain in detail to me how it is? https://support.mozilla.org/en-US/kb/thunderbird-and-junk-spam-messages so that I can give you advice? For the spam like characteristics it s that there are to many connections opened to the receiving server at the moment and sended to much emails in a short period for explanation. For connection and throughput. Greetings Firefox volunteer.