Welcome message sent to new users added to this domain. $$ is a carriage return. BNF syntax of this attribute is:
value:: <subjectline\>’$’[<opt_headers\>]’$$’<body\>subjectline:: ’Subject:’[<TEXT\>]opt_headers::<header_line\>’$’[<opt_headers\>] header_line:: <header_name\>’:’<TEXT\>header_name:: <TEXT\>body:: [<lines\>]lines:: <line\>’$’[<lines\>]line:: <TEXT\>