Overview
To help your team consistently receive important communications from Clozd (including interview notifications, published reports, contributor invitations, and feedback requests), we recommend allowlisting our sending domains.
This article contains the following sections:
Why allowlisting matters
Clozd employs industry-standard authentication (SPF, DKIM, DMARC), but some email security systems may occasionally filter or quarantine automated, bulk, or similarly structured messages. Allowlisting our domains reduces the risk of these messages being blocked.
Scenarios improved by allowlisting:
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Contributor portal invitations not arriving
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Published interview or report notifications getting quarantined
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Feedback requests or sales feedback requests blocked by spam filters
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Bulk emails or CC’d messages flagged by email security systems
Domains to allowlist
To ensure smooth delivery, please have your IT team explicitly allow these domains:
| Domain | Purpose |
|---|---|
| @clozd.com | Communications from Clozd team members (program managers, support, etc.) |
| @notifications.clozd.com | Automated emails: interview published notifications, report availability, Contributor Portal invites, new user account setup |
| @invitations.clozd.com | Invitations to participate in buyer feedback interviews |
| @survey.clozd.com | Invitations for buyers to provide feedback via surveys |
| @salesfeedback.clozd.com | Invitations for your sales reps to submit internal feedback |
These domains should be allowlisted in your:
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Mail server settings (Microsoft 365, Google Workspace, Exchange)
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Email security gateways or spam filters (Proofpoint, Mimecast, Barracuda, etc.)
Note: Be sure to include any domains configured for Clozd to send emails on your behalf.
Recommended: IP address allowlisting
For optimal security, it is advised to allowlist both the domains and the IP addresses that Clozd uses to send email. If your security infrastructure supports IP-based allowlisting, please incorporate the following IP ranges:
Clozd transactional mail
(Includes contributor portal invitations, notifications for published interviews or reports, and feedback requests)
- 50.31.156.96/27
- 104.245.209.192/26
- 50.31.205.204/30
Clozd production mail
(Emails transmitted to participants and copied/cc:d to Clozd customers)
- 50.31.205.167/32
- 50.31.205.168/32
Releasing quarantined emails
If Clozd emails are already quarantined:
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Check your spam/quarantine logs for emails from Clozd domains.
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Mark the messages as safe or trusted.
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Explicitly add Clozd domains to your organization’s safe sender or allowlist.
Platform-specific configuration guides
Detailed instructions for common email gateways are available below:
Frequently asked questions
Q: We allowlisted everything, but emails are still missing. What now?
A: Check for post-delivery scanning or link analysis. Some tools inspect emails after delivery and may block links or attachments. Consider excluding Clozd domains from these scans.
Q: Can we test if allowlisting worked?
A: Yes. We can send test messages. Email support@clozd.com, and we’ll coordinate a quick deliverability test with you.
Questions?
If you’d like assistance, please email support@clozd.com or contact your Clozd program manager directly.