What's a Reasonable Inbox Size?

[Asai]

> We rotate the folder to another name with the date like INBOX-2020-05-07
> with instructions how to refresh their folder list (or even modify the
> .subscription file for the).
>
> We also cull Trash, deleted items, and spam folders automatically as well.
>
> Regards,
> KAM

That makes sense.  So you're saying that very large inboxes are 
generally bad for mobile devices?  How are they bad for the servers?

Asai