When I try to read a body of a message I get the following exception
com.sun.mail.util.DecodingException: BASE64Decoder: Error in encoded stream: needed at least 2 valid base64 characters, but only got 1 before padding character (=), the 10 most recent characters were: "><hr size="
This occurs in getContent(); of a Part of a Message.
It looks like the message claims that the data is base64 encoded, but it's not.
Most likely the message is spam, just throw it away. If it's a legitimate message,
you need to inform the owner of the software that created the message that
their software is broken.