You can configure your G Suite instance to send mail using SocketLabs.
Please find the Instructions below, originally written by Google. We have included the links to Google's instructions for further reading.
Allow per-user outbound gateways
By default, users cannot use an outbound gateway. The G Suite mail servers deliver all outgoing mail, including mail that uses alternate From addresses.
To allow users to use an outbound gateway:
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Sign in to your Google Admin console using an administrator account.
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From the Admin console Home page, go to Apps > G Suite > Gmail > Advanced settings.
Tip: To see Advanced settings, scroll to the bottom of the Gmail page. -
In the Allow per-user outbound gateways section, select Allow users to send mail through an external SMTP server when configuring a "from" address hosted outside your email domains.
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At the bottom, click Save. Please note it can take up to an hour for changes to propagate to user accounts.
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Once this option is enabled, users can configure their alternate email addresses to use an outbound gateway. Each user must configure this option individually.
Send emails from a different address or alias
- On your computer, open Gmail.
- In the top right, click Settings Settings and then Settings.
- Click the Accounts and import or Accounts tab.
- In the "Send mail as" section, click Add another email address.
- Enter your name and the address you want to send from.
- Click Next Step and then Send verification.
- For school or work accounts, enter the SMTP server (for example, smtp.gmail.com or smtp.yourschool.edu) and the username and password on that account.
- Click Add Account.
- Sign in to the account you added.
- Open the confirmation message you got from Gmail.
- Click the link.
- In the message, click the "From" line. (If you don't see this, click the space next to the recipient's email.)
- Select the address to send from.