Email is getting deleted from my phone (not by me) Samsung fascinate

[lswim]

Email messages will not stay in my inbox and I am not deleting them.  When I hit the load more messages button, it looks like the phone is searching the network for messages but nothing happens.  I should have over 20 mesaages from over the past few days on my phone but they are all gone..  The messages are not in any other folder and I have the setting "confirm delete" set on my phone.

I was on the phone for over 1 hour yesterday with technical support and they have no clue why this is happening.  We went through every setting and reinstalled email but nothing is working.  I cannot handle another 1 hour phone call with tech support again since I actually have to work for a living and raise a family.  Does this phone just stink or am I doing something wrong?  The support guy suggested that my email provider RCN, was to blame. Of course that would absolve Verizon of all of this.

[Wildman]

Did you check the number of days the client is set to retrieve, try looking to see if this option is under the email client / menu / Settings / Send and Recieve options.

[lswim]

Under "incoming server settings", I have "never" for "Delete email from server".

There does not appear to be any relevant tabs under "outgoing server settings".

Any other suggestions?  I am signed up for a class next week for the Fascinate to help me use my phone better.  I am not a tech person but I did not think I was technically pathetic either.

[Aftershock]

If you access your email using a mail program that downloads your messages from the server and then removes them from the server the messages disappear from the phone.
I figured this out when I access my mail on my PC. I use Thunderbird and have it set to remove the downloaded emails from the mail server.