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Bev
I've taken a look at the idnet site and it seems that they give out fixed IPV4 addresses and a /48 for IPV6 - so rebooting your router won't have changed the address.
One question I don't think we have addressed is whether the problem only occurs on this one specific email address at idnet (you say you use Tbird for others such as gmx).
I should have said. It's two addresses. (One IMAP the other POP.) Same securemail server address though.
Well the router *claimed* to get a new IP address within the range you suggested so ...
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After that, I'm out of ideas. But my money is on either a corruption in your idnet account, or some weird comms problem between you and the idnet IMAP server.
I mean I'm no expert (obviously!) but this is my hunch. Nothing else has worked so some comms glitch that means it mithers about showing me the emails is the only thing left.
Will investigate your other suggestion, though. Thanks for your time, Mick.
Bev.