If you want to have your Viadeo notifications sent to a different email address:
Mouse-over your photo in the upper right-hand corner and click Your Account;
Go to Login data & personal information, type in your secondary email address, and click Add. Check your inbox for a validation email from Viadeo.
Once you’ve confirmed your new email, go back to the settings page and click Change primary email. Your notifications will be sent to the new email address.
Consider adding a second email address to your account. You will be able to reset your password if you forget it or if you don’t have access to your main email address.
If you’ve already entered two email addresses, you must delete one before adding another.