Use Google OAuth to Send From Help Scout
If you are using your own email address with Help Scout, we send email on your behalf via our own Help Scout mail servers by default. If your custom email address is a full G Suite user mailbox, you may choose to configure Help Scout to send your email from Google's servers instead, using Google OAuth.
If you are using any email provider other than Google, take a look at Use SMTP to Send From Help Scout for help to set up that connection.
Note: If you are using your Help Scout email address directly — e.g. firstname.lastname@example.org — you cannot configure Google OAuth to send from that address.
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Reasons to Use OAuth
Using customized outgoing settings allows you to save all of your outgoing replies to Gmail/G Suite for archive or backup purposes. Sending from Google's servers may also assist with email deliverability.
It's worth mentioning that if you go this route, you do not have to add Help Scout to your SPF record or set up DKIM records, as the email will be going out from Google's servers instead of ours. For peace of mind though, you may want to create those records in case we have any problems connecting to Google to send. We will fallback to sending from our own servers if we are unable to connect to Google OAuth at any time.
Configure Connection Settings
Before authenticating, you'll want to ensure that you're logged in to the Gmail account for your mailbox address (e.g., email@example.com). Google OAuth will not work with Google Groups addresses.
Open the desired mailbox and head over to Mailbox Settings > Connection Settings.
Select the Use my custom outgoing (SMTP) settings option. Click on the Send with Gmail button, and then the Sign in with Google button.
Choose the Google account associated with your mailbox address or choose Use another account to sign in to Google as the mailbox address. Click the blue Allow button on the next screen to allow Help Scout to use that Gmail account to send email.
The next page will take you back to Help Scout where you will have a Sending via... confirmation stating that your SMTP settings are properly set up. Don't forget to hit the blue Save Settings button.
You can disconnect from Google OAuth at anytime by clicking on the blue Disconnect link next to the Google icon.