Default Increase stock email limit..??

Does anyone know how to increase the 5000 total email limit on the stock (not gmail) email app?
If you have several email accts and have them sync ALL mail it goes bonky at 5000 and keeps telling you 5000 is limit.

Swyped from Sprint Samsung Galaxy Note® 3 using Tapatalk.
Device: Currently HTC One M8 HK Edition Backup: Sprint Samsung Galaxy Note™ 3.
Active Rom: Stock Rooted S-Off
Kernel: Custom
External Storage: 128gb UHS class 10 microSDXC