Apple Mail

OldCant wrote:

I have random emails go missing and some not arrive at all. (I know this cause fortunately they are arriving on my laptop...and the missing ones are there also). Left hand mailbox menu changes without warning as well. I had a 'All sent' which I use regularly...it is gone.

I have googled; checked to make sure I haven't accidentally deleted; checked I haven't blocked; checked mail settings, POP etc.

Looking forward to knowing if this a shared problem and how I might overcome it. (thank goodness for my old MacBook Pro lap top keeping my mail going...)

Mac is iMac 21.5", latest Big Sur

Laptop is MacBook Pro 13" Mojave 10

You can rebuild a mailbox if it is isolated issue

Rebuild mailboxes in Mail on Mac - Apple Support

for problem accounts the go to way to sort issue is simply delete the account and then add it back in

Remove email accounts in Mail on Mac

https://support.apple.com/en-lamr/guide/mail/mlhl9eb9408c/15.0/mac/12.0

Add email accounts in Mail on Mac - Apple Support

https://support.apple.com/en-lamr/guide/mail/mail35803/mac

Note—

• IMAP accounts stay on the server, so no local loss, when you re-sync

• POP accounts download and remove from the server—therefor save your inbox/sent box if you want them

• "On My Mac" is just that, local folders you created and moved mail into. So no loss