If you use scripts on your server, they can be abused by spammers to send messages directly over port 25 without being filtered by our outbound filter. Actually, there is no reason why a script should be able to send messages over port 25.
To prevent outgoing connections over port 25 and route all traffic through the EuropeanMX filter, you can use the following IP tables in your firewall:
iptables -A OUTPUT -p tcp --dport 25 -j DROP
iptables -D OUTPUT -p tcp --dport 25 -j DROP
ip6tables -A OUTPUT -p tcp --dport 25 -j DROP
ip6tables -D OUTPUT -p tcp --dport 25 -j DROP
Please make sure that the rules are applied automatically after a restart.
Safeguard your online assets with Web Application Firewalls (WAFs)! Discover how WAFs protect against cyber threats like SQL injections and XSS, enhancing your business's security and compliance.
Discover the essential differences between WAFs and traditional firewalls in our comprehensive guide. Learn how each protects, their unique advantages, and the best use cases for optimal security.
Discover the indispensable role of the web application firewall (WAF) in protecting your online business. Learn how it fends off attacks, ensures compliance, and builds trust with your customers. Dive into the future of WAF technology and how it will evolve to meet the threats of tomorrow.
Explore the crucial role of Web Application Firewalls (WAFs) in safeguarding web apps from cyber threats. Learn how WAFs work, their benefits, challenges, and best practices for optimal security.
Discover how Zero Trust Architecture is reshaping cybersecurity. Learn its principles, benefits, and implementation strategies for a more secure future.
Discover the future of web security! Learn the top WAF features in 2025, from AI integration and zero-day attack protection to advanced threat intelligence and API security. Stay ahead in cybersecurity!
Discover how a Web Application Firewall (WAF) became a game-changer for an e-commerce giant, thwarting a severe DDoS attack and preventing a catastrophic data breach. Learn the power of proactive cybersecurity!
Discover how Web Application Firewalls (WAFs) are crucial for protecting APIs against cyber threats, ensuring secure data exchange in today's digital landscape. Learn about their benefits, workings, and best practices.