+=item override_content
+
+A string to use as the HTML body; if specified, replaces the entire
+body of the message. This should be used ONLY by L<FS::report_batch> and may
+go away in the future.
+
+=item attach
+
+A L<MIME::Entity> (or arrayref of them) to attach to the message.
+
+=item to_contact_classnum
+
+Set a string containing a comma-separated list. This list may contain:
+
+- the text "invoice" indicating contacts with invoice_dest flag should
+ be included
+- the text "message" indicating contacts with message_dest flag should
+ be included
+- numbers representing classnum id values for email contact classes.
+ If any classnum are present, emails should only be sent to contact_email
+ addresses where contact_email.classnum contains one of these classes.
+ The classnum 0 also includes where contact_email.classnum IS NULL
+
+If neither 'invoice' nor 'message' has been specified, this method will
+behave as if 'invoice' had been selected
+
+=cut
+