Inbox not saving emails past 2 months

How do i change the storage on my inbox? It isn’t keeping anything longer than 2 months where as my Sent box has my whole history. Help please.

Which mail provider are you using? Do you know if you’re connected using POP3/IMAP?

I have this same problem.  Using Proximus in Belgium.  I am using IMAP and have checked download emails and attachments for offline use.  But they do not get saved beyond about 2 months.