Setup SMTP Email Relay with Gmail (GSuite)

  • Updated

With SMTP relay enabled, your Gmail/Google Workspace users can send emails from inside OneMob while those emails actually route through Gmail — meaning they'll show up in each user's Sent Mail, just like any other email they send.

Setup happens in two places: your Google Workspace Admin console and your OneMob admin settings. Complete the Google Workspace steps first.

 

Part 1: Google Workspace Settings

Step 1: Create a bounce-handling user

Create a new user in Google Workspace with the email address onemob-bounced@yourcompany.com (replace "yourcompany.com" with your actual domain). This address will be used as the return path for bounced emails. See Google's guide on creating a new user.

Step 2: Whitelist OneMob's IP for SMTP relay

  1. Log in to admin.google.com as a Google Workspace Admin.
  2. Go to Apps > Google Workspace > Gmail > Advanced Settings.
  3. Scroll to the SMTP Relay Service section and click Edit (appears on hover).
  4. Check the option Only accept mail from the specified IP addresses.
  5. Click Add IP range, then enter: 34.214.115.223
    • You can label this entry "OneMob" or any name you'll recognize later.
  6. Save your changes and return to Advanced Settings.

Step 3: Enable comprehensive mail storage

In the same Advanced Settings for Gmail, confirm that Comprehensive Mail Storage is checked.

Step 4: Forward bounced emails to OneMob

This allows OneMob to track bounced emails on your behalf.

  1. From Advanced Settings, scroll to the Routing section.
  2. Click Configure (or Edit, if a rule already exists).
  3. Check Inbound.
  4. Check Only affect specific envelope recipients, and enter the bounce address you created in Step 1: onemob-bounced@yourcompany.com
  5. Under Also deliver to, click Add, and enter: bounced@onemob.com
  6. Click Save.

Step 5: Whitelist OneMob's domain

Whitelist @onemob.com so your users reliably receive email invites and notifications from OneMob.

 

Part 2: OneMob Settings

  1. As a OneMob Admin, go to Admin Settings.
  2. Click SMTP Settings.
  3. Toggle SMTP Settings on.
  4. Enter the following:
Field Value
IP or Host smtp-relay.gmail.com
Port 587
Domain Your website without "www." (e.g., onemob.com)
Return path for bounced emails The bounce address from Part 1, Step 1 (e.g., onemob-bounced@yourcompany.com)
User Name / Password Leave blank for most setups
  1. Click Save Changes.

 

Test the Integration

Send a New Email from OneMob to an email address you have access to, and confirm the "From" address matches the login email of the OneMob account that sent it.

 

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