remove my bogus test to exclude /net from /mail/lib/senders validation.
just bind the appropriate file to /mail/lib/senders in
/rc/bin/service*/tcp25.

Notes:
Wed Jun 16 13:27:58 EDT 2004 rsc
    asked presotto to look to make sure we dont'b
    break our own machines applying this.
    


Reference: /n/sources/patch/applied/smtpd-net-not-exempt
Date: Wed Jun 16 23:34:38 CES 2004
Reviewed-by: rsc

--- /sys/src/cmd/upas/smtp/smtpd.c	Wed Jun 16 23:34:38 2004
+++ /sys/src/cmd/upas/smtp/smtpd.c	Wed Jun 16 23:34:38 2004
@@ -421,9 +421,6 @@
 	Sender *snd;
 	Ndbtuple *nt, *next, *first;
 
-	/* internal mail is exempt from this checking */
-	if (strcmp(nci->root, "/net") == 0)
-		return 1;
 	rdsenders();
 	for (snd = sendlist; snd != nil; snd = snd->next) {
 		if (strcmp(rcpt, snd->rcpt) != 0)