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I encounter a situation, when I send a email which email subject more than 80 char, sometimes the email subject will be insert a 'tab' char. I check the invalid email's mail header, they are aligned, if a mail header entry more than 80 char, it will be wrap to a new line, and insert a 'tab'. I don't know which configuration control it, javaMail setting? STMP setting?

I have a problem with my java code sending email to users. There is some problem with the encoding of the email. When the email arrives to email account the subject line ($subject) has encoding problems as has strange characters(?) added to the end of my subject text. The email message content itself is fine just the subject line(?) I have searched all over but cant find,after using Unicode and content type as text/html mail body have no problem with special character ( ó ) but same fix is not working for subject line. I have a class that sends an email with javamail, with a text like this one in subject : "Estimado Iván Escobedo: The problem is that when the mail arrives to its destination, it arrives this way: "Estimado Iv?n Escobedo: All the á , é , í , ó , ú , etc special characters are replaced with ? . What could be the problem and how to solve it?