Cannot Send Mail - The Connection to the outgoing server failed
This seems the same or similar to other email issues mentioned before. I can get emails to send if they are going through the broadband supplied router direct or on 4g. The moment it is connected to Deco M5 emails have stopped going and I get the 'Cannot Send Mail' - the connection to the outgoing server failed.
I have turned of the Malicious Content Filter, Intrusion Prevention System, Infected Devices Quarantine. Tried using 2.4 or 5ghz on their own. With and without passwords for the wifi.
The interesting thing is that this had been working fine for the last few years and the latest firmware was updated months ago without any issues. So this seems very strange. It started happening to a friend 12 weeks ago, but our attention was focused on the domain/email provider instead. Now on closer inspection it clearly is something to do with the Deco M5.
Is there a solution for this please?