4 engineers on Hacker News describe using Cyrus IMAP first-hand: 0 endorse it, 1 regret it, 0 are mixed.
“We recently switched over to Atmail after years of running Cyrus+Postfix (with various anti-spam tools).”
regret · production · mvip · 2012-01-30 · source ↗ · wrong label?“We build two separate Debian packages: cyrus-fastmail for production, and cyrus-future for testing.”
neutral · production · brongondwana · 2014-12-20 · source ↗ · wrong label?“Under the hood it's all Cyrus IMAPd server with a ton of customisations”
neutral · production · brongondwana · 2013-05-22 · source ↗ · wrong label?“Postfix, Cyrus, IMAPS, SMTPS, POP3S, HTTPS, Sieve for filters on the server”
neutral · production · 3 yr · Deadsunrise · 2012-02-05 · source ↗ · wrong label?