Admins and IT teams can add the following email addresses, IP addresses, and URLs to their organization's allowlist so that engagement survey invitations reach participants' inboxes and survey links are accessible.
When complete, participants receive survey invitations in their inbox rather than spam, and survey URLs load without being blocked.
Before You Begin
- You must have access to Engagement. This feature is available on the Engage, Legacy Perform, and Total Platform packages.
- Allowlist changes must be made by your IT team inside your organization's email platform or network firewall — not inside 15Five.
Emails and IP addresses to allowlist
Provide your IT team with the following sending addresses and partner domain to add to your email allowlist.
Email addresses:
- surveys@15five.com
- support@15five.com
- *.15five.com
IP addresses (required only if your email service uses IP-level allowlisting):
| IP Address | Hostname |
|---|---|
| 192.174.93.53 | mta-93-53.sparkpostmail.com |
| 192.174.93.52 | mta-93-52.sparkpostmail.com |
| 147.253.223.127 | mta-223-127.sparkpostmail.com |
| 147.253.223.126 | mta-223-126.sparkpostmail.com |
Email vendor configuration guides
If your IT team needs instructions for their specific platform, refer to the following resources:
| Platform | Resource |
|---|---|
| Google Workspace | Allowlist email senders in Google Workspace |
| Google Workspace (IP allowlisting) | Allowlist IP addresses in Google Workspace |
| Microsoft Exchange Online | Configure connection filtering in Exchange Online.aspx) |
| Microsoft Exchange 2010 | Configure IP allow lists in Exchange 2010.aspx) |
| Microsoft Office 365 | Link to be added |
URLs to allowlist
If employees access surveys from computers with restricted internet access, provide your IT team with the following URLs to allowlist. Add both http and https variants for each.
- amazontrust.com/*
- fonts.googleapis.com/*
- .ss2.us/
If Something Goes Wrong
| Issue | Check | Fix |
|---|---|---|
| Participants report survey invitations going to spam | Confirm all four IP addresses and both email addresses are added to the allowlist | Provide your IT team with the complete IP and email address list from this article and ask them to re-verify each entry |
| Survey links are inaccessible on employee devices | Confirm all three URLs are allowlisted for both http and https
|
Provide your IT team with the URL list from this article and request they apply allowlist rules to both protocols |
| IT team is unsure how to configure allowlisting in their platform | Identify the email platform in use | Direct your IT team to the relevant vendor guide in the table above |
Not Covered Here
This article does not cover sending a test notification to verify deliverability before a campaign launches. See Test the deliverability of engagement campaign notifications.