Subject: sendmail 8.6.10
To: None <current-users@NetBSD.ORG>
From: Adam Glass <glass@NetBSD.ORG>
List: current-users
Date: 02/23/1995 12:12:45
the latest sendmail with the latest security fix will be in tomorrow's
sup unless the sup database is rebuilt earlier for some reason.

I think you can probably get away with just updating the sendmail

Adam Glass