How Do I Sync Less Email?

Hello!

I have an iPhone 6 and my iOS is 8.3. I have several email accounts set-up on my phone and as such I have a TON messages, making my total unread emails 15,000+ 😮 So I would like to only sync messages from the past month or so.

I know that this was previously possible by going to Settings - Mail, Contacts, Calendars - < account> - Mail Days to Sync however this is no longer an option. Or if it is then it is not in the same place.

Can someone please help?

Thank you so much in advance!