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, 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 your Handshake Relationship Manager.
(e.g. 5k rate limit for recipients every hour)
Whitelist by IP
We send email from a dedicated set of IP addresses, please whitelist all of these:
220.127.116.11 18.104.22.168 22.214.171.124 126.96.36.199 188.8.131.52
Whitelist 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 Whitelist if you use Google Apps
Google Apps Console for Gmail as this will ensure no messages are flagged as spam. This can be accomplished by following this guide. There are also some general guidelines for bulk emailing recommended by Google if you are mass emailing using Handshake, which can be found here.