I had a good number of people add me to their circles on Google Plus. Which is great! However, friends, co-workers, family members and acquaintances all know me by different email addresses. I was determined to find out what Google had in place (if anything) to rectify this issue. A little googling led me to the Google Accounts Management screen. Of course, you need to be logged in first but from this page you can link other emails to your Google account.
Now, be aware that a Google Account is not the same as a Gmail account. You can have a Google account to access Google services and not really have a Gmail account. Gmail is just another service Google provides, just like Google Calendar, Google Analytics, Google Adsense, etc. A Google account is a unified sign-in system that gives you access the various Google services ( here is a list of most of these services ). That being said, you would want to add all your email and email aliasses to your Google account. Start by clicking on “Edit” next to email addresses on the Google Account Management screen.
On the next screen you will see a list of emails pending verification ( if any ) and a textbox to enter a new email address. Entering a new address will send you right back to this same page but with the new address added to the list of “pending verification” email addresses. In your inbox of the new email address you provided, you should receive an email from “email@example.com” asking you to click on a link to verify the address is actually yours. The link will take you to an account verification page where you will put your Google account username and password.
Upon successful verification you should now be able to log into any Google service you are already registered to by using the new email address and your current Google password. Furthermore, if someone attempts to add you to one of their Google Plus circles referring to you by that email address; Google will recognize the email address as an email that is linked to your Google account. Now you don’t need to worry that your old college friends know you as firstname.lastname@example.org, your family knows you as email@example.com, your co-workers as firstname.lastname@example.org but you are registered as email@example.com on your Google Plus account !