s/qmail can survive with just one control file, me, containing the fully-qualified name of the current host. This file is used as the default for other hostname-related control files.
Comments ('# comment') are allowed in badmailfrom, badmimetypes, badloadertypes, dkimdomains, locals, percenthack, qmqpservers, rcpthosts, smtproutes, srsdomains, tlsdestinations, and virtualdomains. Trailing spaces and tabs are allowed in any control.
The following table lists all control files other than me. See the corresponding man pages for further details.
control defaultused by authsenders(none)qmail-remote badhelo (none)qmail-smtpd badmailfrom(none)qmail-smtpd badmimetypes$BADMIMETYPEqmail-smtpd badloadertypes$BADLOADERTYPEqmail-smtpd badrcptto (none)qmail-smtpd bouncefromMAILER-DAEMONqmail-send bouncehostmeqmail-send bouncemaxbytes0qmail-send concurrencylocal10qmail-send concurrencyremote20qmail-send dkimdomains(none)qmail-dksign domaincerts(none) qmail-remote domainips (none)qmail-remote, qmail-smtpam defaultdomainmeqmail-inject defaulthostmeqmail-inject databytes $DATABYTESqmail-smtpd doublebouncehostmeqmail-send doublebouncetopostmasterqmail-send envnoathostmeqmail-send helohost meqmail-remote idhost meqmail-inject localiphostmeqmail-smtpd locals meqmail-send morercpthosts(none)qmail-smtpd mailfromrules(none)qmail-smtpd percenthack(none)qmail-send plusdomainmeqmail-inject qmqpservers(none)qmail-qmqpc qmtproutes(none)qmail-remote queuelifetime604800qmail-send rcpthosts (none)qmail-smtpd recipients(none)qmail-smtpd spfexplain SPF_DEFEXPqmail-smtpd spflocalrules(none)qmail-smtpd srsdomains(none)srsforward, srsreverse smtpgreetingmeqmail-smtpd smtproutes(none)qmail-remote timeoutconnect60qmail-remote, qmail-smtpam timeoutremote1200qmail-remote, qmail-smtpam timeoutsmtpd1200qmail-smtpd tlsdestinations(none)qmail-remote, qmail-smtpam virtualdomains(none)qmail-send
Use
qmail-showctl
to display actual settings.