I went into my email manager this morning and have created five accounts which will be used exclusively for B.Net.

Basically:
1-something@shaw
2-something@shaw
3-something@shaw
4-something@shaw
5-something@shaw

Then I went into Battle Net and registered a new Battle Net account.
Clicked the verify link.
Logged into the email account, opened the B.Net email and clicked the link.
Then logged out of the email and b.net accounts.

Repeated the procedure for 2, 3 and 4.

Trying to repeat for 5.
I can log into and out of the B.Net account and the Email without issues.
I've verified the email names are exactly the same.
I can click the send verification email on the B.Net account.
I do not receive anything in the Email account.
I can send to this email address from another source.

Anyone know if B.Net has something to prevent multiple account creations from the same IP address?
I know quite a few people have had issues paying with the same credit card for multiple accounts at once.