Email Delivery: Whitelisting Big Interview Email

Big Interview uses highly reputable email domains to ensure that emails are delivered. However, email delivery can still sometimes fail due to various security systems between Big Interview and students.

In order to ensure email deliverability, Big Interview monitors and acts on spam scores, blacklisting, IP throttling, and more.

In addition to whitelisting IPs and domains, please identify any internal limitations you may have with receiving email and surface them to our Support Team.

Whitelist by IP

We send emails from a dedicated set of IP addresses. Please whitelist all of these:

* 149.72.130.208

* 198.37.155.82

Whitelist by Domain (Optional)

* biginterview.com

* mail.biginterview.com

* email.biginterview.com

* o2.ptr3529.biginterview.com

How to Whitelist if you use Google Workspace

Use the Google Workspace Console for Gmail to ensure no messages are flagged as spam. This can be accomplished by following this: https://support.google.com/a/answer/60751?hl=en

There are also some general guidelines for bulk emailing recommended by Google if you are mass emailing using Handshake: https://support.google.com/mail/answer/81126

How to Whitelist if you use Microsoft Office 365

Navigate to the Office 365 admin portals. This can be accomplished by following this: https://learn.microsoft.com/en-us/defender-office-365/anti-spam-policies-configure

The "Clutter" folder or "Focused Inbox" can also cause delivery confusion. Please see this guide to assist users if this occurs: https://support.microsoft.com/en-us/office/focused-inbox-for-outlook-f445ad7f-02f4-4294-a82e-71d8964e3978

Updated on: 26/03/2026