Extra header_checks for Postfix

/^Subject:(.*)[Ss]ildenalfil/						REJECT You meant the v-word.
/^Subject:(.*)[Cc]itrate/						REJECT You meant the v-word.
/^Subject:(.*)[Cc]ialis/						REJECT c_ialis. 
/^Subject:(.*)[Ee]nzyte/						REJECT e_nzyte.
/^Content\-Transfer\-Encoding:(.*)base64$/				REJECT base_64