Email Client - Delete Emails from device?

[ConTejas]

What email client are you ladies and gents using? The only thing I miss about my long past BB days is their email service. I hate how stock Android doesn't actually delete the emails in say my comcast or yahoo personal email accounts. Or at least I never setup mine properly to do so. I've been using Kaiten email client for a while (lead dev from K-9..kaiten = K 10) and I thought all was well, but it doesn't look like it's deleting them either. I have "sync server deletions" and "delete from server when I delete a message" checked. Any advice or recommendations? Thanks.