Manual blacklist management doesn't scale. Every minute you spend adding malicious IPs to a blacklist is a minute attackers are using to probe your defenses. You need automation.
SecZim's auto-blacklist feature identifies malicious behavior and blocks offenders automatically—no human intervention required.
How Auto-Blacklisting Works
Behavior Detection
SecZim monitors every connection for signs of malicious activity
Threshold Tracking
Counts violations per IP: SPF failures, rate limit hits, policy rejections
Automatic Blocking
When threshold exceeded, IP is automatically added to blacklist
Alert Notification
Admin receives instant notification of new block
Configurable Triggers
Define exactly what behavior triggers automatic blocking. Every organization has different needs—SecZim adapts to yours.
SPF Failures
Block IPs that repeatedly fail SPF verification
Rate Limit Violations
Auto-block aggressive senders who hit rate limits
Policy Rejections
Block IPs triggering your security policies
Invalid Recipients
Block IPs sending to non-existent addresses
Threshold Customization
Not all violations are equal. Configure different thresholds for different violation types:
- 5 SPF failures in 1 hour → Block for 24 hours
- 10 rate limit hits in 30 minutes → Block for 1 week
- 50 invalid recipient attempts → Permanent block
- Any violation from blocked country → Permanent block
Self-Defending Infrastructure
Auto-blacklisting creates a self-defending email system. The more attackers probe, the stronger your defenses become. Every attack attempt trains your system to recognize and block similar threats.
IP Reputation Tracking
SecZim maintains a reputation score for every IP that connects to your server. Good behavior improves scores; bad behavior decreases them. Low-reputation IPs face stricter scrutiny and faster blacklisting.
Reputation Factors
- Historical violation count
- Time since last violation
- Geographic risk level
- Volume of legitimate email sent
- SPF/DKIM pass rates
Temporary vs. Permanent Blocks
Not every violation deserves a permanent ban. SecZim supports graduated responses:
- First offense: 1-hour temporary block
- Second offense: 24-hour block
- Third offense: 1-week block
- Fourth offense: Permanent blacklist
This graduated approach catches legitimate senders who make occasional mistakes while permanently blocking persistent attackers.
Whitelist Protection
Worried about blocking legitimate senders? Whitelisted IPs, domains, and email addresses are never auto-blacklisted. Your trusted partners are always protected.
Complete Visibility
See exactly what's being auto-blocked and why:
- Real-time alerts when IPs are blacklisted
- Complete history of violations per IP
- One-click unblock for false positives
- Export blacklist for analysis
Set It and Forget It Security
Stop manually managing blacklists. Let SecZim's auto-blacklist feature block bad actors automatically.
Start Free TrialThe Power of Automation
Auto-blacklisting transforms your email security from reactive to proactive. Instead of responding to attacks after the damage is done, you're blocking attackers before they succeed.
Your email server learns. It adapts. It defends itself.