The "undeliverable mail" has been a known problem since 5 October. See
this thread.
No mention of the logon problem, but maybe there is a connection. Perhaps the service was taken down for a short period, as you imply it was working at some time.
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
My broadband basic info/help site -
www.robertos.me.uk. Domains, site and mail hosting -
Tsohost.
Connection - AAISP Home::1 80/20. Sync 59999/14372kbps @ 600m. -
BQM