Development Control Center
Domain Verification
Register and verify a client-owned sender domain before activating email delivery. Verification is performed against the real public DNS TXT record.
1. Register sender domain
Use the domain the client authorized for simulation mail. The platform will generate a unique TXT proof value.
2. Publish the TXT proof
- Copy the TXT value for the pending domain below.
- In the client's DNS provider, create a TXT record on the domain.
- Use the root host/name unless the provider asks for the full domain.
- Wait for DNS propagation, then click Verify DNS.
3. Verify DNS and authorize sending
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Phishing Simulation Whitelisting Guide
Provide these details to client SOC / Exchange administrators to whitelist simulation traffic in Microsoft 365 Defender or Google Workspace.
Dedicated Sending IP
Add to client inbound IP allowlist or gateway bypass.
148.113.243.123Outbound MTA Hostname (HELO/EHLO)
FQDN matching Reverse DNS (rDNS).
relay.saasyncinc.comTenant Whitelisting Quick Steps
Microsoft 365 Defender
Go to Security Center → Policies & Rules → Threat Policies → Advanced Delivery. Under Phishing Simulation, add Sending IP 148.113.243.123 and domain relay.saasyncinc.com.
Google Workspace
Navigate to Admin Console → Apps → Google Workspace → Gmail → Spam, phishing, and malware. Under Email Allowlist or Inbound Gateway, add 148.113.243.123.