+Base64-encoded data is wrapped with `b64<>'.
+(Beware that the SMTP transaction may contain authentication information either
+in plaintext or easily decoded base64.)
+The
+.B \-notls
+switch will disable all attempts to negotiate TLS.
+.PP
+If port 465 is specified and none of the TLS switches were enabled,
+.B \-initialtls
+will be implied if TLS support was compiled in. Though port 465 for
+SMTPS (SMTP over SSL) was deregistered by IANA in 1998, it is still
+used for that service.
+.PP
+.B post
+filters out header lines with names beginning with \*(lqNmh-\*(rq
+(case insensitive) from the message draft.
+Those lines are reserved for internal
+.B nmh
+use.