Setup SMTP Email Relay with Outlook

With OneMob, you can give your Outlook users access to send emails from inside OneMob — but routed through Outlook, so they come from your company's own email server rather than OneMob's. 

Setup happens in two places: your Microsoft 365 / Outlook admin settings and your OneMob admin settings. Complete the Outlook steps first.

Part 1: Outlook (Microsoft 365) Settings

Step 1: Allow open relay from OneMob's IP

Whitelist OneMob's IP address — 34.214.115.223 — on your SMTP server so it's permitted to relay mail through your domain. See Microsoft's guide on enabling SMTP relay in Office 365.

Step 2: Create a bounce-handling mailbox

Create a new mailbox in Outlook with the address onemob-bounced@yourcompany.com (replace "yourcompany.com" with your actual domain). This will be used as the return path for bounced emails.

Step 3: Forward bounced emails to OneMob

Set up forwarding so all emails sent to onemob-bounced@yourcompany.com are also forwarded to bounced@onemob.com. This allows OneMob to track bounces on your behalf.

Step 4: 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:

5. 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.

SMTP relay is available on the Enterprise plan.