Apple Mail not showing all mails

[AlienRei]

Greetings everyone,
I need help, big help in this. I have Apple Mail 9.3 El Capitan and various folders inside it. Everything works fine but when I import emails from Thunderbird (I used it for a while and regret it) in mbox format Mail.app keeps hiding random emails. I know they are there because if I try to find them with the searchbox they instantly show up and I also see them in the mail folder using Finder, but there is no way I can show them in Apple Mail until I open them from Finder.
I also deleted the Envelope index files and rebuilt mailboxes.
How is it possible?

Thank you for any help.

Bye
Alan

 

[BrianBaughn]

First, make sure that, in a folder/mailbox with the "missing" email, View>Organize by Conversation is unchecked.

 

[AlienRei]

First, make sure that, in a folder/mailbox with the "missing" email, View>Organize by Conversation is unchecked.

I did it, no folder is organized as a conversation, the strange thing is that I have folders with thousands of emails and they are fine, others with just 145 I can see only a few messages... That's extremely odd. All the files are present in finder.

 

[AlienRei]

Nobody got any clue? I can't figure this out, the emails files are all there, but I can't show them in Apple Mail, very very odd!

 

[DavidinSF]

Nobody got any clue? I can't figure this out, the emails files are all there, but I can't show them in Apple Mail, very very odd!

Have you figured this out? I have the exact same issue. Have tried everything, including “rebuild”.