iPhone slow to send/receive Rogers emails?!

There is often a long delay in pushing emails to my iPhone from my Rogers email account.

When I know there is an email on my server, I hit the reload icon and get the message "Checking for mail..." and nothing is downloaded. Some messages don't show up for hours after I needed them. Even some outgoing messages disappear after hitting the "send" button and never make it to the person.

The only temporary solution that I have found is to power down my phone and restart it. Once it is restarted the messages are sent to the phone. Should the phone not download the emails from the server every time I hit the refresh icon??

After I restart the phone it seems to work well for a short period of time when sending and receiving but then seems to have this issue when the phone is on for longer periods.

Any suggestions??

Thanks in advance.