I can`t receive my emails on my phone BB 8520 Curve

Hallo, I have a problem. I can`t receive my emails on my phone (Blackberry 8520).
When I open email settings, I have to fill in my user name and password. I type my password and log in, and the message that I receive is: ,,The information you provided is incorrect. Retype your user name and password. Your user name and password are case sensitive''. I am sure in 100% that my username and password are correct. Any way, I tryied with an option ,,Forgot Password". The message that I receive is,, Your password has been successfully sent to your BB device''. Ok, but where in my phone this ,,new" password is located?
In email settings I have only one option instead option to add an existing email account.
P.S. I suspect that this problem arise when I made some settings in my email address in ,,gmail.com'' each time when I recieve an email to receive SMS?
I will appreciate so much your help. Thank you for your reply in advance.

Have you tried deleting the account and tried setting it up again?

I would try Jaydee's option first and then see if it works if not I wouldn't know to suggest to do on the phone.

You could also pop into a phone shop and ask someone I am sure there must be some geeks out there who are good with tech