According to RFC5321 section 4.5.3.1.8 we aren't allowed to have a
max-rcpt lower than 100 (MUST). This diff prevents admins from setting
max-rcpt to anything lower than 100.

OK?

martijn@

diff b9146a17035f22954d6f1be04af1b32218d3b317 85f1ad07b22990cf52e6c13160cc696bf2948fa6
commit - b9146a17035f22954d6f1be04af1b32218d3b317
commit + 85f1ad07b22990cf52e6c13160cc696bf2948fa6
blob - b4cf1f21ddb02dce7a4911285e33eebfcf517067
blob + dda128bfd70c096b3290a2e0fc1dc84ca6cdc53d
--- usr.sbin/smtpd/parse.y
+++ usr.sbin/smtpd/parse.y
@@ -2037,6 +2037,11 @@ limits_smtp	: opt_limit_smtp limits_smtp
 
 opt_limit_smtp : STRING NUMBER {
 			if (!strcmp($1, "max-rcpt")) {
+				if ($2 < 100) {
+					yyerror("max-rcpt can't be lower than 100");
+					free($1);
+					YYERROR;
+				}
 				conf->sc_session_max_rcpt = $2;
 			}
 			else if (!strcmp($1, "max-mails")) {