Not storing emails?

[#1]

I seem to be having a problem with my emails on Plusnet. I use Outlook express 6 for my emails and seem to receive them ok when someone sends an email to my Plusnet email address. The thing is they are not being stored or even showing when i log in to my emails through the member centre. I used to be with Sky and every one of my my emails was stored on their web page even if i had opened them in outlook. What do i need to do to get them to show up in Plusnet email?

[#2]

on the post box properties advanced page tick the box leave a copy on server

[#3]

Thanks for the quick reply. Was easy to find, always is when you know what your looking for.

[#4]

there is a finite limit to the amount you can save on the server, not sure what it is though maybe a thousand may be a lot more

[#5]

Having a few on there will be a start, its always been empty. Not very good when i want to check an old email from another computer.