On Mon, Mar 04, 2024 at 11:41:07PM +0000, ghe2001 wrote: > 1) The 5, pi5.slsware.lan, keeps sending me email saying, > > "*** SECURITY information for pi5 ***" So, "pi5" appears to be your hostname. > "pi5 : Mar 4 15:40:14 : root : unable to resolve host pi5: Name or service not known" > > I have no idea why it's complaining or what's bent. It can't resolve its own hostname. You're probably missing a line in your /etc/hosts file.