[Evolution] cannot connect to my mail server (jumpline, virtual)

["webmaster" <ximian hillsidedrive com>]

Hi all, I'm new to the list so forgive me if a similar issue has been posted
before.
I use Jumpline.com to host my web site and they provide me with a pop mail
server like "mail.mydomain.com".  This is a server on a shared IP.  Also, my
username is in a strange format, they require a percent (%) symbol in the
name like so:
  "username%mydomain.com"
Evolution is not able to connect, and I get no error messages.  Other mail
clients don't have any trouble.
I can connect to my ISP's pop server and download messages (even when not on
their network, for example from work), so I know Evolution works.
According to Jumpline tech support, "It has to do with the way that
Evolution formats the username and hostname when it connects".

My questions:

Why can KMail (in Linux) and Outlook (in Windows) connect to this account
but Evolution cannot?  I suspect it has something to do with the shared ip
or the % in the username.

Does anyone have any suggestions as to how I can get this to work?

Thanks,
  Bret