Thank you both for your assistance and pointers, much appreciated.
I have already checked everything except doing a telnet. All spellings and passwords visually double checked (copied and pasted from Keepass), and also typed in manually. SMS messages are working OK. The link shown is the link pointed to in the '‘Please follow this guide’ link on the Router SMTP settings config box.
Firstly, a sanitised screenshot of my working email client (setting work for Linux, Windows, Android and IOS).
Now my Router SMTP config box.
Finally, a screenshot of a telnet test on port 587 of the eMail server
The email server /var/log/mail.log shows no connection from any device other than the ones trying to connect to the server mail every 10secs (fail2ban takes care of them!). This could mean a problem with the router config, or the MVNO (Lebara), however, I can send emails from other devices.
You can see that I have no ‘Protocol’ box showing, and I guess my question is…
‘How do I know the eMail is being sent correctly, using the correct port and security protocol?’
With no connection to the email server, it suggests that either the email is not being sent, or there is something wrong with the protocol. Unfortunately, the GL.iNet Guide tells me to select the protocol, but the option isn’t available on the page.
Is this an oversight in the instructions for updated firmware?
Or, is my firmware not loaded correctly?
Or, does firmware version 3.215 recognise the port and use the correct protocol?
HTH
Oh, also tried this originally with Wireguard. Also tried openVPN, but currently using NO VPN.