Email Problem with iphone 6

Hi my name Prashant

i have problem with my i phone 6 , email Problem. i have total mails in my inbox 24000+,

exact problem ......... is there any limitation of mails on iphone

when i delete 10 mails i ll receive 10 mails, when i delete 2 mail then i ll recieve 2 mail, i ll not receive more than 24000+ mails,

my mobile storage is 128GB

i have space near about 80+ Gb,

is there any settings and changes i have to done on iphone

please help me?............