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.

*Not Available on Forever Free Plan