? appears before the disclamer

Hello,
I try to send an email with java mail client via zoho mail.

Hello this is a test message.

?
---------------------
Disclaimer:
Content of disclaimer....
---------------------

Here is my java client:

Message message = new MimeMessage(getSession());
message.setFrom(new InternetAddress(mailFrom));
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
message.setSubject("Test");
message.setTest("Hello, this is a test message.");
Transport.send(message);

Please help me to explain how the character ? appears between the content message and the disclaimer.

Many thanks.