Professional Email System Management
Email remains critical for business, but managing email infrastructure requires expertise. With years of Postfix and Exim experience from production environments, I build and maintain email systems that deliver reliably, fight spam effectively, and stay secure.
What I Provide
Email Server Setup
- Postfix installation and configuration
- Exim setup and tuning
- SMTP relay configuration
- Virtual domain management
- Mailbox management
- Alias configuration
- SSL/TLS encryption
Email Security
- SPF record configuration
- DKIM signing setup
- DMARC policy implementation
- TLS encryption enforcement
- Authentication mechanisms
- Relay restrictions
- Connection limits
Spam & Virus Protection
- SpamAssassin integration
- Spam filtering rules
- Greylisting implementation
- Blacklist/whitelist management
- Virus scanning (ClamAV)
- Content filtering
- Rate limiting
Email Authentication
- SMTP authentication
- SASL configuration
- User authentication
- Certificate management
- Secure connections
- Password policies
High Availability
- Multi-server setup
- MX record configuration
- Failover setup
- Load balancing
- Backup MX servers
- Queue management
- Disaster recovery
Monitoring & Maintenance
- Email queue monitoring
- Delivery tracking
- Performance monitoring
- Log analysis
- Alert configuration
- Regular maintenance
- Backup management
Migration Services
- Email server migration
- Mailbox migration
- Configuration migration
- DNS updates
- Testing and validation
- Cutover planning
Who This Is For
- Organizations Self-Hosting Email: Need expert management
- Growing Businesses: Outgrowing basic email setups
- Security-Conscious Companies: Want control over email infrastructure
- Technical Teams: Need email expertise
- Anyone Migrating: From hosted to self-hosted or vice versa
Real-World Email Experience
At DENIC eG (2015-2019), I managed:
- Production email systems (Postfix/Exim)
- High-volume email infrastructure
- Email security implementation
- Spam filtering and protection
- Email authentication
- Multi-server configurations
- Disaster recovery
- Performance optimization
Email Technologies I Work With
Mail Transfer Agents (MTA)
- Postfix (preferred for most cases)
- Exim (complex routing scenarios)
- Sendmail (legacy support)
Authentication
- SASL (Cyrus, Dovecot)
- PAM authentication
- LDAP integration
- Active Directory integration
Spam Filtering
- SpamAssassin
- Rspamd
- Amavis
- Greylisting (postgrey)
Virus Scanning
- ClamAV
- Amavis integration
Monitoring
- Mailgraph
- pflogsumm (Postfix log analyzer)
- Custom monitoring scripts
Common Email Solutions
Small Business Email Server
- Postfix + Dovecot
- SpamAssassin
- SSL/TLS encryption
- SPF/DKIM/DMARC
- Webmail (Roundcube)
- Backup solution
High-Volume Relay
- Postfix configuration
- Queue optimization
- Connection management
- Rate limiting
- Performance tuning
- Monitoring
Secure Email Gateway
- Inbound filtering
- Outbound scanning
- Spam protection
- Virus scanning
- Content filtering
- Compliance rules
Email Migration
- From Exchange to Postfix
- Between hosting providers
- Mailbox migration
- Configuration transfer
- DNS updates
- Testing phase
The Implementation Process
Phase 1: Assessment (1 week)
- Current email analysis
- Requirements gathering
- Volume estimation
- Security requirements
- Integration needs
- Migration planning
Phase 2: Design (1-2 weeks)
- Architecture design
- Security configuration
- Spam filtering strategy
- Authentication setup
- High availability plan
- Monitoring design
Phase 3: Implementation (2-4 weeks)
- Server setup
- Configuration
- Security hardening
- Testing
- Spam filter tuning
- Documentation
Phase 4: Migration (1-2 weeks)
- Parallel running
- Mailbox migration
- DNS updates
- Validation
- Cutover
- Support
Phase 5: Optimization (Ongoing)
- Performance tuning
- Spam filter adjustment
- Security updates
- Monitoring review
- Capacity planning
Email Security Best Practices
Authentication
- SPF: Specify authorized senders
- DKIM: Sign outgoing messages
- DMARC: Policy for failed authentication
- TLS: Encrypt connections
- SASL: Authenticate users
Protection
- Relay restrictions
- Connection rate limiting
- Recipient validation
- Greylisting
- Spam scoring
- Virus scanning
- Content filtering
Monitoring
- Queue monitoring
- Bounce tracking
- Authentication failures
- Blacklist monitoring
- Performance metrics
- Security logs
Common Problems I Solve
- Email Delivery Issues: SPF/DKIM/DMARC misconfigurations
- Spam Problems: Too much spam or false positives
- Blacklisting: IP reputation recovery
- Performance: Slow email delivery
- Security: Open relay or vulnerable configurations
- Queue Buildup: Stuck messages
- Authentication Failures: User access issues
- Migration Issues: Mailbox transition problems
My Email Philosophy
Delivery First: Email must be delivered reliably
Security Important: Protect against spam and attacks
Authentication Essential: SPF/DKIM/DMARC are mandatory
Monitoring Critical: Know what’s happening
Performance Matters: Fast delivery is expected
Spam Balance: Block spam without false positives
What Makes This Different
Unlike basic email setups or expensive managed services:
- Production email expertise from enterprise environments
- Both Postfix and Exim experience
- Security-first approach
- Personal attention
- Ongoing optimization
Business Benefits
Control: Full control over email infrastructure
Security: Implement policies you need
Privacy: Email stays on your servers
Customization: Configure exactly as needed
Cost: Potentially lower than hosted
Integration: Integrate with existing systems
Compliance: Meet regulatory requirements
Advanced Capabilities
Complex Routing
- Content-based routing
- Sender-based routing
- Destination routing
- Priority handling
- Multi-path delivery
Integration
- CRM integration
- Ticketing system integration
- Application email
- Automated notifications
- Mailing lists
Compliance
- Email archiving
- Retention policies
- Encryption requirements
- Audit trails
- Legal hold
Monitoring & Alerting
What to Monitor:
- Queue length
- Delivery rates
- Bounce rates
- Spam scores
- Authentication failures
- Blacklist status
- Disk space
- Service availability
Alerts:
- Queue buildup
- Service failures
- Blacklist additions
- Authentication issues
- Delivery problems
- Disk space warnings
Email Migration Scenarios
From Hosted to Self-Hosted
- Cost reduction
- More control
- Custom configuration
- Privacy requirements
From Self-Hosted to Hosted
- Reduce management burden
- Better reliability
- Compliance requirements
- Scalability needs
Between Providers
- Cost optimization
- Feature requirements
- Geographic requirements
- Vendor change
Server Upgrade
- New hardware
- OS upgrade
- Version update
- Configuration improvements
Ongoing Maintenance
Regular Tasks
- Security updates
- Spam filter tuning
- Certificate renewal
- Backup verification
- Log review
- Performance monitoring
- Blacklist checking
Periodic Tasks
- Configuration review
- Security audit
- Capacity planning
- Documentation updates
- Policy review
Team Enablement
I don’t just set up email—I enable your team:
- Configuration documentation
- Troubleshooting guides
- Common tasks training
- Monitoring interpretation
- Emergency procedures
Investment in Email Infrastructure
Email infrastructure requires expertise to do right. With production experience managing Postfix and Exim in enterprise environments, I ensure your email is reliable, secure, and properly configured.
This isn’t about following tutorials—it’s about applying years of email infrastructure experience to build systems that deliver reliably, fight spam effectively, and stay secure.