Dear All,

I have a a sender that his email address is from same email domain with mine. Initially was able to receive messages from his side without any issues. Last week I observed that all messages received from this sender move to spam folder. I have already marked sender as not junk, add sender address to my personal address book and supposedly Thunderbird will not mark message as junk if is in your personal address book, I have also reset Junk training data. However although sender emails marked as not junk and moved to inbox after short time return to spam folder. Is it something that I am missing? FYI I have already search for a solution but nothing worked. Thanks in advance.