Dovecot Consulting & Administration

Dovecot is the gold standard open-source IMAP/POP3 server — powering millions of mailboxes worldwide. Zwiegnet provides deep expertise in deploying, optimizing, securing, and maintaining Dovecot on Linux for businesses, ISPs, schools, and enterprises seeking secure, high-performance email without proprietary lock-in.

Our Dovecot services include:

• Dovecot Installation & Configuration – Full setup on AlmaLinux, Rocky, Ubuntu LTS; IMAP, POP3, LMTP, submission, and Sieve/managesieve support.
• High Availability & Clustering – Active/active clustering, shared storage (NFS/ZFS), dsync replication, and automatic failover for zero-downtime email.
• Security Hardening – TLS 1.3 enforcement, certificate management, client certificate auth, rate limiting, and protection against brute-force attacks.
• Authentication & Integration – LDAP (OpenLDAP/389DS/AD), Kerberos (GSSAPI), SASL, PAM, and integration with Postfix, RADIUS, and SSO.
• Spam & Virus Protection – Sieve filtering, integration with SpamAssassin, ClamAV, and advanced user-defined rules.
• Migration & Data Import – Migrate mailboxes from Exchange, Zimbra, Google Workspace, or legacy IMAP servers; dsync for zero-downtime sync.
• Performance Tuning & Scaling – Optimize for thousands of concurrent connections, mailbox indexing, quota management, and monitoring (Prometheus/Grafana).
• Backup & Recovery – dsync backups, ZFS snapshots, off-site replication, and tested recovery procedures.

Ideal for: small-to-mid-sized businesses, schools, non-profits, law firms, healthcare practices, and enterprises seeking secure, self-hosted IMAP/POP3 email with full control and no subscription fees.

Located between Madison and Milwaukee, Wisconsin since 2009 — direct access to Dovecot specialists with proven experience in high-availability, self-hosted email environments on Linux.