"days to sync" option for email?

Hello,  I have an iPhone 6 with IOS 11.  Could you please tell me where the option is to select how many emails sync with the phone?  It used to be under settings/accounts/email account/days to sync.  Now it's gone.  I recently re-loaded my email accounts and went from zero unread emails to 769.  I am so frustrated I want to cry.


Any help is greatly appreciated.

iPhone 6, iOS 11.2.2
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Thank you for this post; it is helpful!


I figured out another solution...when entering the email account in settings, using "outlook" instead of "other" and "hotmail" will do the trick.  The "days to sync" option is back! 

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