I'm using JavaMail to send email, but seems yahoo or hotmail treat the emails sent by javamail as spam emails and filtered them out. So email recipants won't be able to receive my emails. Does anybody have clue on this? Do I miss some parameters? BTW, when recipant set the filter to the lowest level, they can mostly receive emails sent by my JavaMail.
This has also happened to me in companies that I have worked for. The best course of action is to review the spam policy of yahoo and hotmail to see if there are special email headers you can add to prove that you are not spam.