Official Technical Information for emailprotect.cz Mail Gateways
The domain emailprotect.cz is an infrastructure domain used for outbound email delivery via our managed FortiMail Secure Email Gateways. We provide advanced threat protection, spam filtering, and virus scanning for our business customers.
To ensure high deliverability and security, our systems are compliant with the following standards:
| Reverse DNS (PTR) | All outgoing mail servers have valid, matching PTR records. |
| SPF & DKIM | We support and encourage the use of SPF, DKIM, and DMARC for sender authentication. |
| TLS Encryption | Mandatory or Opportunistic TLS (STARTTLS) is enabled for all outbound connections. |
| Rate Limiting | We employ strict outbound rate-limiting to prevent sudden spikes caused by compromised accounts. |
If you are an ISP or mail administrator and need to whitelist our gateway IPs, please find our current outbound ranges below:
We have a zero-tolerance policy regarding unsolicited commercial email (SPAM). Our FortiMail systems use real-time behavioral analysis, RBLs, and heuristic scanning to identify and block malicious traffic at the source.
If you have received unsolicited mail from our network or wish to report a false positive/negative, please contact our security team.
Please include full message headers and any relevant SMTP error codes in your report.