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Cannot send, but receive OK
Sending of the message failed. The message could not be sent using Outgoing server (SMTP) send.xtra.co.nz for an unknown reason. Please verify that your Outgoing server (SMTP) settings are correct and try again. Checked these - see images
I've tried turning off the firewall & AV and every thing I can find on google which seems relevant.
The problem first appeared after a Win 10 update not long before Xmas.