Netgear Nighthawk M1 IMAP/SMTP Restrictions??
We are out in the country and have rural internet via Fixed Wireless ISP. I got the Netgear Nighthawk M1 ("hotspot") as a backup because the ISP connectivity is unreliable. It is configured as IP passthrough and connected to the FailOver WAN port on my router. This works great, almost, as we never get interrupted. However, when it switches to the hotspot none of our email works. Outlook, MacOS Mail, Windows Mail -- none of the clients will send or receive IMAP/SMTP email. Exchange server connections work fine. We can go to the gmail.com website and use the web interface no problem. But email clients can't connect to any IMAP/SMTP mail servers. (Gmail, iCloud, etc.)
Is this restricted somehow on AT&T's end? And if so, why? We can use our AT&T iPhones as a hotspot and that works. It is just the Netgear hotspot that causes this issue.