SSL/TLS in Postfix and Dovecot: why and how
Let's Encrypt certificate, ports 465/587/993/995, TLS 1.2 where there is a password, Dovecot 2.3 and 2.4, tests, and MTA-STS against the attack that strips STARTTLS.
DKIM and DMARC on Postfix with OpenDKIM and OpenDMARC
SPF, DKIM signing with OpenDKIM, DMARC policy, and verification with OpenDMARC on Postfix, tested on Ubuntu 24.04 and 26.04.
ISPConfig 3.3.2: Ubuntu 26.04, DMARC, and security fixes
ISPConfig 3.3.2 ships Ubuntu 26.04, DMARC on the inbound path, database backups that don't lock up tables, and fixes a SQL injection in the remote API and a privilege escalation in Fetchmail. See what changed, the 3.3.2p1 patch, and how to update safely.
go-postfixadmin: a modern dashboard for your Postfix server
Anyone who has built an email server with Postfix + Dovecot knows the ritual: the classic PHP PostfixAdmin, a web server configured just for it, and an interface frozen in time. go-postfixadmin is my modern answer: a single Go binary with the entire Vue 3 frontend embedded — a dashboard … Read more
go-imapsync: Migrating IMAP Mailboxes with a Single Go Binary
Migrate IMAP mailboxes with go-imapsync: installation, protected credentials, TLS, dry run, incremental copy and validation, with the limits of version 0.1.3.
Installing Zimbra 10.1 FOSS on Ubuntu
Synacor no longer provides free FOSS binaries. Anyone who wants Zimbra 10.1 on Ubuntu downloads a community tarball: maldua/zimbra-foss or bTactic builds. Below: a clean installation on Ubuntu 22.04 and 24.04 LTS, DNS, install.sh, and the first zmcontrol status. This is not an official Synacor build; it is the tarball the forum uses when the … Read more
The history of the Zimbra server
Zimbra is the Ajax groupware platform that wanted to be Exchange for Linux. It began as LiquidSys in 2003, became Zimbra Inc. on July 26, 2005, and took its name from the Talking Heads song I Zimbra. In September 2007, Yahoo bought it for US$ 350 million. Then came VMware, Telligent, and Synacor. On the 31 … Read more
The history of Roundcube webmail
Roundcube began as a personal project in Switzerland in July 2005: an IMAP webmail application in PHP that used real Ajax, not a CGI form. The first stable release came on March 4, 2008. Version 1.0 followed on April 7, 2014. On May 10, 2026, version 1.7 arrived. On the 6 … Read more
The history of PostfixAdmin: the virtual user's service counter
In 2002, Mischa Peters of High5! released a PHP application so he would not have to edit MySQL by hand: virtual domains, mailboxes, and aliases. He called it PostfixAdmin. GPL. Postfix delivered the mail; it lacked a service counter. Twenty-four years later, PostfixAdmin 4.0.5 (July 5, 2026) is still that counter — now with TOTP, app passwords, DKIM, … Read more
The history of Dovecot: the dovecote that became IMAP
In July 2002, a Finnish developer who had already written irssi released an IMAP server designed to be neither Courier nor UW. He called it Dovecot — a shelter for pigeons. Five years later, on April 13, 2007, version 1.0.0 arrived. Timo Sirainen noted: “almost five years, but it is ready.” Twenty-four … Read more