🛡️
🏆 Enterprise Email Security Solution
An Email Security Gateway protects against spam, phishing, malware and other email-based threats with multi-layered security.
99.9%
Spam Detection
95%
Phishing Block
24/7
Threat Protection
Table of Contents
1. Email Security Gateway Overview
💡 Multi-Layer Email Security
An Email Security Gateway implements multiple security layers to filter and protect emails before they reach end users.
Core Features
🛡️ Spam & Malware Protection
- • Spam filtering with ML algorithms
- • Malware scanning (viruses, trojans)
- • Attachment filtering
- • URL reputation checking
- • Content filtering
🎣 Phishing & Social Engineering
- • Phishing URL detection
- • Brand impersonation detection
- • Social engineering protection
- • BEC (Business Email Compromise) protection
- • Spear-phishing detection
Gateway Architecture
🌐
Internet
Incoming emails
🛡️
Security Gateway
Filtering & scanning
📧
Mail Server
Exchange/Office 365
👥
End Users
Secure emails
2. Email Threats
Current Threat Landscape
📊 Threat Statistics 2024
- • 91% of all cyber attacks start with email
- • 3.4 billion spam emails daily
- • 85% of companies experience phishing attacks
- • 74% of ransomware attacks via email
- • 60% of BEC attacks successful
🎯 Attack Vectors
- • Malware attachments (Office macros)
- • Phishing links to fake logins
- • Social engineering (CEO fraud)
- • Spear-phishing (targeted attacks)
- • Whaling (C-level targeting)
Threat Types
🦠 Malware via Email
Attachment-based:
- • Office documents with macros
- • PDF files with JavaScript
- • Executable files (.exe, .bat)
- • Archives with hidden malware
Link-based:
- • Drive-by downloads
- • Malware download links
- • Phishing websites
- • Exploit kits
🎣 Phishing & Social Engineering
Phishing Types:
- • Mass phishing (spam)
- • Spear-phishing (targeted)
- • Whaling (C-level)
- • Vishing (voice-phishing)
Social Engineering:
- • CEO fraud (BEC)
- • Vendor impersonation
- • Urgency & authority
- • Pretexting
3. Planning & Architecture
Architecture Decisions
☁️ Cloud-based Solution
- • No local infrastructure
- • Automatic updates
- • Global threat intelligence
- • Scalable performance
- • Managed service
🏢 On-Premise Solution
- • Full control
- • Compliance requirements
- • Integration with local systems
- • No internet dependency
- • Custom configuration
DNS Configuration
# DNS MX Record Configuration
# Before (direct to mail server)
example.com. IN MX 10 mail.example.com.
# After (via security gateway)
example.com. IN MX 10 gateway.security-provider.com.
example.com. IN MX 20 mail.example.com.
# SPF Record for additional protection
example.com. IN TXT "v=spf1 include:security-provider.com ~all"
# DMARC Policy
_dmarc.example.com. IN TXT "v=DMARC1; p=quarantine; rua=mailto:dmarc@example.com"
# DKIM Signing (from gateway provider)Capacity Planning
📊
Email Volume
Daily email count per user
💾
Storage
Quarantine and logs
⚡
Performance
Scanning speed
4. Implementation
Deployment Steps
1
DNS Configuration
Redirect MX records to security gateway:
MX: gateway.security-provider.com⚠️ Important Note
DNS changes can take up to 48 hours.
2
Gateway Configuration
Configure security gateway for your domain:
- ✅ Domain verification
- ✅ User synchronization
- ✅ Policy configuration
- ✅ Whitelist/blacklist setup
- ✅ Quarantine configuration
3
Mail Server Integration
Exchange/Office 365:
- • Connector configuration
- • Transport rules
- • Journaling setup
- • API integration
Other Mail Servers:
- • SMTP relay configuration
- • Authentication setup
- • TLS/SSL configuration
- • Logging & monitoring
4
Testing & Validation
Comprehensive tests to validate configuration:
✅ Tests successful
Email flow, spam filtering, quarantine and reporting working correctly.
5. Advanced Configuration
Policy Configuration
🛡️ Spam Filtering
Filter Settings:
- • Spam threshold: 5-7
- • Bayesian filtering: Enabled
- • RBL check: Enabled
- • Greylisting: Enabled
Actions:
- • Quarantine: High spam
- • Tag: Low spam
- • Block: Known spammers
- • Whitelist: Trusted
🎣 Phishing Protection
URL Protection:
- • Real-time URL scanning
- • Brand protection
- • Link rewriting
- • Safe browsing API
Content Analysis:
- • Machine learning detection
- • Social engineering patterns
- • BEC detection
- • Impersonation detection
🔒 Malware & Attachment Filtering
# Email Security Gateway Policy Configuration
# Attachment Filtering
[AttachmentFilter]
Enabled=true
BlockedExtensions=.exe,.bat,.cmd,.com,.pif,.scr,.vbs,.js
MaxFileSize=25MB
ScanArchives=true
PasswordProtectedArchives=Block
# Malware Scanning
[MalwareScan]
Enabled=true
ScanEngine=Multiple
HeuristicAnalysis=true
SandboxAnalysis=true
CloudLookup=true
# Content Filtering
[ContentFilter]
Enabled=true
Keywords=Block
RegExPatterns=Block
ImageAnalysis=true
OCRScanning=true
# Encryption & DLP
[Encryption]
Enabled=true
TLSEnforcement=true
DLPEnabled=true
SensitiveDataPatterns=Block6. Monitoring & Management
Dashboard & Reporting
📊 Key Metrics
Spam Detection Rate
99.9%
False Positive Rate
<0.1%
Phishing Block Rate
95%
🔍 Incident Response
Automatic Response:
- • Quarantine suspicious emails
- • Block known threats
- • Notify administrators
- • Log all events
Manual Response:
- • Quarantine review
- • Policy adjustments
- • Threat intelligence updates
- • User training
7. Best Practices
✅ Recommended Practices
Configuration
- • Gradual policy implementation
- • Regular whitelist reviews
- • Monitor false positives
- • Backup configuration
Operations
- • Daily quarantine reviews
- • Weekly reports
- • Monthly policy updates
- • Regular user training
❌ Common Mistakes to Avoid
Technical Errors
- • Too aggressive filter settings
- • Missing whitelist maintenance
- • Insufficient monitoring
- • Missing backup strategies
Organizational Errors
- • Missing user training
- • Unclear incident response
- • Missing documentation
- • No regular reviews
🚀
Tavo-IT Email Security Services
As cybersecurity experts, Tavo-IT offers comprehensive Email Security Gateway implementation and support services.
🛡️
Gateway Setup
Implementation
📧
Spam Protection
Filtering
🎣
Phishing Detection
Protection
📊
Monitoring
24/7 Support