@TomMu ArcherC8. Thanks for your suggestions and help. It turned out that the Ethernet port on the router that I was using to connect the email server was bad. I switched to another port and it works...

@ArcherC8 Thanks for for help. I will try reserving the MAC address. Hopefully, this will allow the email server to be seen by the router. I have a number of entries in port forwarding. All point to...

I am using an Apple iBook 3 laptop running OS9 as an email server on my LAN. It is connected via an Ethernet cable to the router. It works fine with my TP-Link Archer 8 router. I recently bought a...