I would like to know if anyone else has had this problem.
mail seems to be missing e-mails I have requested to be sent.
Part of a login session is to display my e-mail address and request a code be sent.
So far none of those e-mails have bee sent and I have no record of their being sent.
There is a tile limit for sending so I wait that out and request a resend.
This has gone on for several days but it would clear by itself.
Now there is no evidence it is even sent.
The main problem is 1. the sender not doing something correct
2. My e-mail provider has a problem
3. thunderbird is the problem.
I have no way to test this so I am in the dark.