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smtp: try /net.alt on /net dns failure

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

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

@@ -32,7 +32,6 @@

 {

 	int fd;

 	DS ds;

-	char err[Errlen];

 	addr = netmkaddr(addr, 0, "smtp");

 	dial_string_parse(addr, &ds);

@@ -41,8 +40,7 @@

 	fd = callmx(&ds, addr, ddomain);

 	/* try our mail gateway */

-	rerrstr(err, sizeof(err));

-	if(fd < 0 && gdomain && strstr(err, "can't translate") != 0)

+	if(fd < 0 && gdomain)

 		fd = dial(netmkaddr(gdomain, 0, "smtp"), 0, 0, 0);

 	return fd;

@@ -157,7 +155,7 @@

 	else {

 		ds->netdir = "/net";

 		n = mxlookup1(ds, domain);

-		if(n == 0) {

+		if(n <= 0) {

 			ds->netdir = "/net.alt";

 			n = mxlookup1(ds, domain);

 		}

-- 

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