What the rules.MailRules file can and cannot do The rules.MailRules file can contain one of three types of lines: •       a blank line Blank lines have no meaning and are just used to make the file more readable •       a comment line Comment lines start with # and are also used for readability •       a rules line The rules.MailRules file cannot •       script Internet Services's handling of the SMTP conversation (RFC-2821) other than to NDN a message or recipients •       decode MIME (RFC-2045+) (rules.AttachmentBlock can block MIME attachments). Top For more information Default rules.MailRules file