On Thu, 19 Feb 2015 10:26:17 -0500 John Von Essen <john at quonix.net> wrote: > Would > Connect:IPv4 REJECT > Also work? No. Sendmail only prefixes IPv6 addresses, not IPv4. I can't understand why you don't simply use iptables rules or the equivalent; it's far simpler and more efficient. Regards, David.