Some emails, that are on my server, do not appear in my thunderbird listing (or do appear one day and not thereafter), why?
I seem to be loosing some emails. They may (or may not) appear once in the thunderbird listing, but thereafter they are gone. These, typically are from the same source that have previously been received (ie follow up emails) but, once gone from the listing, are not grouped with the previous email or put in the TRASH file.
Chosen solution
There are several possible reasons that messages seem to 'disappear'.
There are two types of email accounts: IMAP and POP. See https://support.mozilla.org/en-US/kb/glossary-terms-including-types-accounts If you have a POP account and are accessing the mail on more than one computer or smartphone, whichever device reads (downloads) the message first will have it locally, but it will no longer be listed or available on the other devices. If you have an IMAP account, the message stays on the server, but if one device (user) moves or deletes the message, it will affect the view on all devices. So, for example, if you are using your smartphone and take some action on an email, when you get back to your computer, it will reflect that same action (but you might not have realized what caused it). Another, less likely, reason for messages not to show up in your inbox is having the preference set to show only unread messages. Then once you read them they seem to disappear.
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Chosen Solution
There are several possible reasons that messages seem to 'disappear'.
There are two types of email accounts: IMAP and POP. See https://support.mozilla.org/en-US/kb/glossary-terms-including-types-accounts If you have a POP account and are accessing the mail on more than one computer or smartphone, whichever device reads (downloads) the message first will have it locally, but it will no longer be listed or available on the other devices. If you have an IMAP account, the message stays on the server, but if one device (user) moves or deletes the message, it will affect the view on all devices. So, for example, if you are using your smartphone and take some action on an email, when you get back to your computer, it will reflect that same action (but you might not have realized what caused it). Another, less likely, reason for messages not to show up in your inbox is having the preference set to show only unread messages. Then once you read them they seem to disappear.