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smtpd: remove unused lastsender logic

--- a/sys/src/cmd/upas/smtp/smtpd.c

+++ b/sys/src/cmd/upas/smtp/smtpd.c

@@ -447,7 +447,6 @@

 sender(String *path)

 {

 	String *s;

-	static char *lastsender;

 	if(rejectcheck())

 		return;

@@ -477,23 +476,6 @@

 		reply("501 5.1.3 Bad character in sender address %s.\r\n",

 			s_to_c(path));

 		return;

-	}

-

-	/*

-	 * if the last sender address resulted in a rejection because the sending

-	 * domain didn't exist and this sender has the same domain, reject

-	 * immediately.

-	 */

-	if(lastsender){

-		if (strncmp(lastsender, s_to_c(path), strlen(lastsender)) == 0){

-			filterstate = REFUSED;

-			rejectcount++;

-			reply("554 5.1.8 Sender domain must exist: %s\r\n",

-				s_to_c(path));

-			return;

-		}

-		free(lastsender);	/* different sender domain */

-		lastsender = 0;

 	}

 	/*