my e-mail is no longer being deleted off my mac mini when I delete from my iPad

Question:

I am working on Mac Mini with Yosemite and my iPad 4

All stuff is up to date.

All my e-mail accounts sync with each other and everything seems fine. But, when I delete my mail on my iPad it does not get deleted on my Mac Mini?

It did before, but now it no longer is updating.

Why?

I'm I missing a setting?

Advise would be very helpful.

Thanks!