how do you control how long emails are kept on iphone when it's a pop account?

emails on my phone (accessing a pop account) stay in the inbox for 14 days then fall out.  my wife loses hers after 7 days.  These are not deleted items, just the mail box doesn't have emails older than those days back, even If we didn't delete them.

I saw a setting in iphone settings, there's a keep deleted items x days.  but these aren't deleted.  they are in the inbox and maybe read, maybe not.

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Tony GiangrecoCommented:
Settings>Mail > Preferences > Accounts (Choose Email Acct) > Advanced and alter your settings
BeGentleWithMe-INeedHelpAuthor Commented:
that doesn't have any settings for days other than remove delete messages after x days.  on my phone that is 1 day, but  things in my inbox are there for 14 days.  that 1 setting is for deleted items.  I am trying to keep read / unread things longer than x days.
Sikhumbuzo NtsadaSenior IT TechnicianCommented:
Usually it's IMAP that does that, I have seen it on my e-mails.
Pop downloads all e-mail to your phone and will keep indefinitely, till you delete.
BeGentleWithMe-INeedHelpAuthor Commented:
still an open issue, but thanks for the comments
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