Postfix Consulting

Zwiegnet offers specialized Postfix consulting — the robust, secure, and highly configurable open-source mail transfer agent preferred for production email environments on Linux. We help organizations deploy and maintain reliable email infrastructure with best-practice security and deliverability.

Our Postfix services include:

• Installation & Basic Configuration – Fresh Postfix setups, virtual domains/aliases, relayhost configuration, and integration with local mailboxes or remote delivery.
• TLS/SSL Encryption – Mandatory TLS, opportunistic encryption, DANE, certificate integration (Let’s Encrypt or commercial), and SMTP opportunistic TLS.
• Authentication & SASL – Integration with Dovecot SASL, Cyrus SASL, LDAP, or Active Directory for authenticated relay.
• Spam & Virus Protection – Amavis + SpamAssassin + ClamAV integration, greylisting, DNSBL (RBL) checks, and policy daemons.
• Content Filtering & Policy – Header/body checks, Milter integration (OpenDKIM, OpenDMARC), and custom restrictions.
• High Availability & Clustering – Multi-node setups with load balancing, failover, and shared queue storage.
• Deliverability Optimization – SPF/DKIM/DMARC alignment, IP reputation management, and bounce handling.
• Monitoring & Logging – Centralized logging, Prometheus exporters, alert setup, and log analysis.
• Performance Tuning – Queue management, concurrency limits, and resource control for high-volume environments.
• Troubleshooting & Break-Fix – Rapid diagnosis of delivery failures, queue issues, relay denials, and blacklisting problems.

Ideal for business email hosting, transactional mail systems, mailing lists, or replacing proprietary mail servers.

Located between Madison and Milwaukee, Wisconsin since 2009 — direct access to experienced Postfix administrators with proven production deployments.