I've set up a domain and linked the email there with Google using Settings > Account for sending emails (and I ticked treat as alias). As well as connecting by POP3 to get the emails.However I want to be able to login to this GMail account using yourname@domain.com email address. How do I go about doing this?
Login to GMail using yourname@domain.com
gmail
Here's Google's support topic regarding additional login email addresses:To add an alternate email address to your Google Account, just follow  these steps:Sign in to your account on the Google Accounts homepage.Click Edit next to 'Email addresses.'Add your alternate email address in the 'Add an additional email address' field.Click Save.Source: http://support.google.com/accounts/bin/answer.py?answer=86635