It's unfortunate that Google services are getting worse every day since Larry took over.
I figured out how to "fix" this issue.
- Go to your Google Admin Console and then click on "Google Apps"
- Click "Gmail" Click "User Settings"
- Scroll down to "SMTP relay service" and click Configure
- Set configurations to the following:
Allowed senders: Only registered app users in my domain
Authentication: Only accept mail from the specified IP addresses (no). Require SMTP authentication (yes)
Encryption: Require TLS encryption (yes)
Once I did these settings I was able to add my additional emails the same as I could in my personal account.
UPDATE: Aaaand it's not working. It fails to authenticate with its own SMTP server even though password and username are correct giving me Authentication failed. Please check your username/password. [Server response: 534-5.7.14 <https://accounts.google.com/ContinueSignIn?sarp=1
error. Great job, Larry!
UPDATE2: And I just got email that explains why it fails to authenticate. Google blocks itself. Genius! :)
Someone recently used your password to try to sign in to your Google
Account [email protected]. This person was using an application such as
an email client or mobile device.
We prevented the sign-in attempt in case this was a hijacker trying to
access your account. Please review the details of the sign-in attempt:
Friday, May 29, 2:41 PM GMT IP Address: 2607:f8b0:4001:c03::229
(mail-ie0-x229.google.com) Location: Unknown
If you do not recognize this sign-in attempt, someone else might be
trying to access your account. You should sign in to your account and
reset your password immediately.