I had updated the plugin last night and quickly had to revert back to the old version because at the top of my the_content it echoed out the following (phony addresses for demonstration):
MAIL: joeshmoe@gmail.com
MAIL: someone@aol.com
MAIL: someoneelse@yahoo.com
MAIL: another@mail.com
{the rest of the content here with properly encoded email addresses}
I viewed the source and these addresses were not even converted to HTML entities.
http://wordpress.org/extend/plugins/simple-mail-address-encoder/