A single compromised account can send thousands of spam emails in minutes. Without rate limiting, your server becomes a spam cannon, your IP gets blacklisted, and legitimate email stops working for everyone.
Rate limiting isn't optional—it's essential. SecZim gives you granular control over email flow to protect your infrastructure and reputation.
The Flood Scenario
An employee clicks a phishing link. Their credentials are stolen. Within an hour, attackers send 50,000 spam emails through your server. By the time you notice, your IP is on every blacklist in existence. Recovery takes weeks.
What Rate Limiting Protects Against
- Compromised accounts being used for spam
- Brute force attacks against your SMTP server
- Email floods that crash your server
- Reputation damage from bulk spam sending
- Resource exhaustion during attack campaigns
SecZim's Flexible Quota System
Set limits based on any combination of sender, recipient, domain, or IP address. Configure different limits for different time windows.
Per Sender Limits
Limit how many emails each user can send
100/hourPer Recipient Limits
Protect mailboxes from being flooded
50/hourPer Domain Limits
Control email volume by domain
1000/dayPer IP Limits
Block aggressive senders by IP
200/hourReal-World Scenarios
Marketing department is whitelisted with higher limits. Email flows normally.
After 100 emails, rate limit triggers. Remaining 9,900 emails rejected. Alert sent to admin.
IP limit exceeded after 200 attempts. All further connections rejected. IP auto-blacklisted.
Intelligent Rate Limiting Features
Sliding Window Counters
Instead of hard resets every hour, SecZim uses sliding windows for smoother, more accurate rate limiting. No more "burst at midnight" exploits.
Whitelist Exceptions
Trusted senders, internal systems, and high-volume legitimate users can be whitelisted to bypass rate limits entirely or get custom higher limits.
Automatic Escalation
When someone hits rate limits repeatedly, SecZim can automatically escalate to temporary blocks or permanent blacklisting. Bad actors get progressively harsher treatment.
Integration with Auto-Blacklist
Rate limit violations feed directly into SecZim's reputation system. Repeat offenders are automatically blacklisted, creating a self-defending email infrastructure.
Performance at Scale
SecZim's rate limiting uses Redis for sub-millisecond counter operations. Even at 10,000+ emails per minute, rate checks add zero perceptible latency.
- Redis-backed atomic counters
- Distributed-ready for multi-server setups
- No database bottlenecks
- Instant enforcement, no delays
Take Control of Your Email Flow
Stop worrying about compromised accounts and email floods. SecZim's rate limiting protects your server automatically.
Start Free TrialEasy Configuration, Powerful Results
Set up rate limits in seconds through SecZim's web dashboard. No configuration files to edit, no server restarts required. Changes take effect immediately.
Your email server is only as secure as its limits. Set them wisely with SecZim.