Step 3: Adding SMTP Relay Host

  1. From the left navigation panel, click Apps > Google Workspace > Gmail.
  2. Scroll-down and click Routing.
  3. Under SMTP relay service, click Add Another Rule.
  4. Enter a description for the rule.

  5. In the Allow Senders list, select Any Addresses checkbox.
  6. Under Authentication, do these:
    1. Select the Only accept mail from the specified IP addresses checkbox.
    2. Add all the IP addresses relevant to your Avanan tenant (account) region.

      For the list of supported IP addresses, see IP Addresses Supported Per Region.

      To add an IP address:

      1. Click Add.
      2. Enter a Description for the IP address.

      3. Enter the IP address.
      4. Select the Enable checkbox.
      5. Click Save.
    3. Clear the Require SMTP Authentication checkbox.
  7. Under Encryption, select the Require TLS encryption checkbox.
  8. Click Save.