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 Handshake IP addresses and domains, please review any internal limits on inbound email (for example, a rate limit of 5,000 recipients per hour) and share those details with your Handshake Relationship Manager.
Unblock by IP
Handshake sends email from a dedicated set of IP addresses. Allow all of the following:
192.237.159.131
161.38.192.196
192.237.159.132
159.112.247.178
192.237.158.52
161.38.199.254
159.112.247.179
69.72.46.73
104.130.123.85
192.237.159.133
159.112.247.180
159.135.237.56
159.112.247.182
159.112.247.181
69.72.44.24
69.72.46.79
69.72.40.228
159.135.226.83
159.112.241.1
159.112.242.178
159.112.252.237
161.38.197.221
161.38.198.110
161.38.199.254Note: Addresses that were italicized in the original list were added as of February 8, 2023
Unblock by Domain (Optional)
Handshake only sends email from these domains:
joinhandshake.com
notifications.joinhandshake.com
mail.joinhandshake.com
m.joinhandshake.com
g.joinhandshake.com
cm.joinhandshake.com
How to Unblock if you use Google Apps
To unblock email domains or IP addresses in Google Workspace (formerly G Suite), you’ll need a paid subscription. Use Google’s admin guidance to:
- Manage IP and domain allowlists
- Review spam, phishing, and delivery settings
Refer to Google’s current admin help for the most accurate, up-to-date steps.
Resources
- To upgrade to a paid subscription, refer to Transition from a free edition
- To add IP addresses to Gmail allowlists, refer to Add IP addresses to allowlists in Gmail
- For general guidance, refer to Email sender guidelines.
How to Unblock if you use Microsoft Office 365
If you use the Microsoft Office 365, you can allow the IPs and domains listed above by configuring your connection filter policy in Microsoft Defender for Office 365. Microsoft’s documentation explains how to add trusted IPs to the IP Allow List and adjust other anti-spam settings.
Messages from Handshake might also be routed automatically to your Clutter (or similar) folder. Microsoft’s Clutter help article explains how to:
- Review items in the Clutter folder
- Change your Clutter preferences
- Turn Clutter on or off if important mail is being filtered out of the main inbox.
Resources
- To review your configuration and filter policy, refer to Configure connection filtering in cloud organizations
- To manage your Clutter preferences, refer to Use Clutter to sort low-priority messages in Outlook