Jelly Bean :: Keeping Emails Locally On Phone?

Samsung galaxy rugby, 4.1 I have a verizon pop email for business The emails are downloaded onto the office computer (outlook 2007) and my Phone. Outlook is set to leave them on the server for 5 days, so if it beats my phone to an email, it is on the server for the phone to grab.

I need to store my emails ON THE PHONE after they are fetched from the server. I need to go back and look at emails 6-12 months, even when I have no cell coverage. I had set "recent messages" option on the android to "total" and that appeared to be saving them on the phone,,

For some reason I had 3000 emails on my server (6 months worth) and when I deleted them,, they disappeared from my phone !! Gone! I went to the email settings on the phone, and noticed that "sync email" was checked, I unchecked that, but then did not receive any new emails.

How do I set an Android phone to just download the email from the server and leave it on the phone,, end of story. just download new emails to my phone. If I delete it on the server it does not affect my phone and vise versa. Preferably storing it on my sd card.