Handshake monitors email delivery and addresses issues such as spam scores, blocked domains, and IP throttling. However, your institution’s email security systems may still block or filter messages.
Share this article with your email administrator to review your institution’s email settings.
In addition to allowing Handshake’s IP addresses and domains, review any internal limits on incoming email, such as a limit of 5,000 recipients per hour. Share those limits with your Handshake Relationship Manager.
Allow Handshake IP addresses
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
161.38.199.254
Allow Handshake domains (optional)
Handshake sends email from the following domains:
joinhandshake.com
notifications.joinhandshake.com
mail.joinhandshake.com
m.joinhandshake.com
g.joinhandshake.com
cm.joinhandshake.com
m.ai.joinhandshake.comAdditionally, allow outbound traffic to smtp.sendgrid.net on port 587.
Note: Insights scheduled report emails are sent through Omni and require separate consideration, as described below.
Scheduled report emails from Omni
Scheduled reports from Insights are sent through Handshake’s analytics provider, Omni, from scheduled-delivery@omni.co.
These emails do not use the Handshake domains or IP addresses listed above. Allowlisting those domains and IP addresses does not cover scheduled report emails.
Why might scheduled report emails go to Junk or quarantine?
Omni’s email authentication policy (DMARC) instructs mail providers to quarantine emails that claim to come from omni.co but fail authentication. Affected emails may be sent to Junk or quarantine.
Could my scheduled reports be affected?
Scheduled report emails may be affected if they:
- Are forwarded to another mailbox or organization.
- Go to a distribution list or shared mailbox that redistributes them.
- Pass through an email security gateway that scans and re-sends them.
These processes can modify an email and break its authentication signature.
If you receive scheduled reports directly in an individual inbox without forwarding or an email security gateway, you should not need to take action.
What should my email administrator do?
Share this guidance with your institution’s email administrator:
- Recommended: Add the forwarding or scanning service as a trusted ARC sealer in your mail provider.
- Short-term option: Add scheduled-delivery@omni.co to Safe Senders on the affected mailboxes.
For detailed instructions, refer to Omni’s guide, Missing Omni emails.
What if a scheduled report email is missing?
- Check your Junk folder.
- If your institution uses Microsoft 365, ask your email administrator to check quarantine.
- If you receive reports through a Google Group, check for emails sent from the group’s address instead of omni.co.
- If you still cannot locate the report email, contact Support.
Unblock Handshake email in Google Workspace
To unblock email domains or IP addresses in Google Workspace, formerly G Suite, you need a paid subscription.
Use Google’s current administrator guidance to review your subscription, manage allowlists, and adjust email delivery settings:
- For subscription requirements, refer to Transition from a free edition.
- To allow IP addresses, refer to Add IP addresses to allowlists in Gmail.
- For general email delivery guidance, refer to Email sender guidelines.
Unblock Handshake email in Microsoft 365
If your institution uses Microsoft 365, your email administrator can allow the Handshake IP addresses and domains listed above by configuring the connection filter policy in Microsoft Defender for Office 365.
For instructions on adding trusted IP addresses to the IP Allow List and adjusting connection filtering settings, refer to Configure connection filtering in cloud organizations.
Handshake emails may also be routed automatically to your Clutter folder or a similar folder. Microsoft’s guidance explains how to review messages, change your Clutter preferences, and turn Clutter on or off. Refer to Use Clutter to sort low-priority messages in Outlook.