Go to Tools, and then Options.
It may be "Special" and then "Configuration" or "Special" and then "Settings" for earlier versions.

On the Options screen, make sure that Personal Info is selected under Category and enter the following:

1. The POP account should be your username@mail.jvlnet.com (all in lower case).
2. The Real name is the name you want to appear next to the email.
3. The Return address is the address you want replies to go to (usually the same as your email address, username@jvlnet.com).
4. The Dialup username should be left blank.

Click OK.

Now, Hosts should be selected under Category. Enter the following:

1. The POP account should be your username@mail.jvlnet.com (all in lower case).
2. The SMTP server should be mail.jvlnet.com (all in lower case).

Click OK.