La configuration de qmail se fait au travers d'un ensemble de petits fichiers situés dans le répertoire /var/qmail/control. La page de manuel qmail-control(5) donne la liste de tous ces fichiers ainsi que leurs valeurs prises par défaut. La commande qmail-showctl permet de visualier les fichiers présents ainsi que les valeurs utilisées :
# qmail-showctl qmail home directory: /var/qmail. user-ext delimiter: -. paternalism (in decimal): 2. silent concurrency limit: 120. subdirectory split: 23. user ids: 502, 503, 504, 0, 505, 506, 507, 508. group ids: 101, 102. badmailfrom: (Default.) Any MAIL FROM is allowed. bouncefrom: (Default.) Bounce user name is MAILER-DAEMON. bouncehost: (Default.) Bounce host name is tarsier.chez.moi. concurrencylocal: (Default.) Local concurrency is 10. concurrencyremote: (Default.) Remote concurrency is 20. databytes: (Default.) SMTP DATA limit is 0 bytes. defaultdomain: Default domain name is chez.moi. defaulthost: (Default.) Default host name is tarsier.chez.moi. doublebouncehost: (Default.) 2B recipient host: tarsier.chez.moi. doublebounceto: (Default.) 2B recipient user: postmaster. envnoathost: (Default.) Presumed domain name is tarsier.chez.moi. helohost: (Default.) SMTP client HELO host name is tarsier.chez.moi. idhost: (Default.) Message-ID host name is tarsier.chez.moi. localiphost: (Default.) Local IP address becomes tarsier.chez.moi. locals: Messages for tarsier.chez.moi are delivered locally. me: My name is tarsier.chez.moi. percenthack: (Default.) The percent hack is not allowed. plusdomain: Plus domain name is chez.moi. qmqpservers: (Default.) No QMQP servers. queuelifetime: (Default.) Message lifetime in the queue is 604800 seconds. rcpthosts: SMTP clients may send messages to recipients at tarsier.chez.moi. morercpthosts: (Default.) No effect. morercpthosts.cdb: (Default.) No effect. smtpgreeting: (Default.) SMTP greeting: 220 tarsier.chez.moi. smtproutes: (Default.) No artificial SMTP routes. timeoutconnect: (Default.) SMTP client connection timeout is 60 seconds. timeoutremote: (Default.) SMTP client data timeout is 1200 seconds. timeoutsmtpd: (Default.) SMTP server data timeout is 1200 seconds. virtualdomains: (Default.) No virtual domains. defaultdelivery: I have no idea what this file does. concurrencyincoming: I have no idea what this file does. #