If you want to use Gmail with custom domain to send out email (i.e., firstname.lastname@example.org), here are the steps you can follow to set it up.
This Google custom email tutorial will demonstrate the use of popular webhosting companies such as SiteGround and Hostgator, but it applies to any other webhosts services that provide SMTP services.
Assuming an email account is already setup, if your webhosting company uses cPanel, you can find the instructions by clicking on the drop-down and select Configure Email Client.
As a new page opens up, scroll to the bottom and look for Manual Settings. Copy the Mail Server Username and Outgoing Mail Server (SSL) information. For the Outgoing Mail Server, typically if you use SiteGround, the server would look like secure####.sgcpanel.com. Or Hostgator, gator###.hostgator.com. Bluehost would look something like box###.bluehost.com.
Now login to your Gmail account and go to Settings on the top-right corner.
Select Accounts, then click on a link Add another email address you own.
On the next dialog box, type in the name you want to be displayed every time an email sent out from that address, and the email address you created earlier.
While we highly recommend SiteGround for your webhosting due to its reliability and speed, this step was already illustrated using Hostgator. But whether you use SiteGround, Hostgator or Bluehost*, the step is exactly the same. Make sure you paste the information copied from Step 2 for the SMTP Server and Username. Click Add Account>> after you’re done.
Google will send a verification code to your new email address, which you need to enter on the verification window. Once you click Verify, your new email address is ready to use.
You can repeat the steps above to add more than one custom email address.
Spending the extra effort to setup domain email with Gmail can make your email look more professional for your business. Hope it helps.
* Due to performance issue we have experienced with Bluehost, we can no longer recommend it as a webhost. Instead, we highly recommend SiteGround as a webhost. We’re very impressed by its performance and reliability that we added SiteGround as our affiliate.