Handshake maintains highly reputable emailing domains to ensure that emails are delivered. However, email delivery can sometimes fail due to the various systems in between Handshake and students which are designed to prevent email abuse. In order to maintain high deliverability, Handshake monitors and acts on spam scores, domain blocking, IP throttling and more.
In addition to unblocking IPs and domains, please identify any internal limitations you may have with receiving email and surface them to your Handshake Relationship Manager.
(e.g. 5k rate limit for recipients every hour)
Unblock by IP
We send email from a dedicated set of IP addresses; please allow access to all of these:
188.8.131.52 184.108.40.206 220.127.116.11 18.104.22.168 22.214.171.124
Unblock by Domain (Optional)
We only send email from these domains:
joinhandshake.com notifications.joinhandshake.com mail.joinhandshake.com m.joinhandshake.com
g.joinhandshake.com cm.joinhandshake.com cmail19.com cmail20.com outbound.createsend.com
How to Unblock if you use Google Apps
You'll need to have a paid subscription for G Suite in order to unblock email domains/IP addresses. With G Suite Basic or above, you can use this guide to unblock email by domain and IP address. General guidelines for bulk emailing, recommended by Google (if you are mass emailing using Handshake) can be found here.
How to Unblock if you use Microsoft Office 365
For Office 365 admin portals - unblocking the above IPs/domains can be accomplished by following the instructions provided here.
Note: Messages may also be automatically routed to the new 'Clutter' folder. Please refer to this Microsoft guide for more information on how to manage your Clutter preferences. This guide will also walk you through enabling/disabling this feature if mail is being sent there that you should be receiving in your general inbox.