Note: This doesn’t change any of your login or email settings for your current account (for this you want a secondary domain).
Login to your Google account at https://admin.google.com/
Navigate to Account > Domains > Manage Domains

Click ‘add domain and start authentication’
Select ‘or switch verification method’
Select ‘Create a TXT record’

Select Next: Go To Step 2

Click on the text under ‘TXT Value’, this will copy it to the clipboard.

Paste this in an email and add it to your DNS records.
BE Business customers we will probably manage your DNS for you, so just email this code to us.
Click ‘Protect My Domain’
Close this page.
Once the record has been added your domain this will be verified when the record is found (this can take a few hours).

BE Business customers stop here
If we don’t manage your DNS, you will need to Activate Gmail. Go through the steps and add the MX records to your DNS as well.
Add your new email to your inbox
Login to gmail.com
Go to Settings > See all settings
Click ‘accounts and import’
Under ‘Send mail as’, click ‘Add another email address’
Update the name and add the email address
Leave ‘treat as an alias’ ticked
Enter your Gmail password in the SMTP settings
Note: If it does not accept your standard account password, you need to create an App passwords – Instructions here
Note: These instructions were out of date when we last looked at them. Just follow this:
Security > How you sign in to Google > 2-Step Verification > App passwords
Then you enter your domain name and receive your PW