The mu info command displays information about Mailutils compile-time configuration. In normal form its output lists a single configuration flag per line, e.g.:
$ mu info
VERSION=2.99.93
SYSCONFDIR=/etc
MAILSPOOLDIR=/var/mail/
SCHEME=mbox
LOG_FACILITY=mail
IPV6
USE_LIBPAM
HAVE_LIBLTDL
WITH_GDBM
WITH_GNUTLS
WITH_GSASL
A configuration flag can consist either of a single word, indicating that a particular capability has been enabled at compile time, or of a keyword/value pair delimited by an equal sign, which indicates a particular value used by default for that feature. For example, ‘IPV6’ means that Mailutils was compiled with support for IPv6, whereas ‘SYSCONFDIR=/etc’ means that the default place for configuration files is in /etc directory.
Such short output is convenient for using mu info in scripts to decide whether it is possible to use a given feature. To assist human users, the --verbose (-v) option is provided. It prints a short description next to each flag:
$ mu info --verbose
VERSION=2.99.93 - Version of this package
SYSCONFDIR=/etc - System configuration directory
MAILSPOOLDIR=/var/mail/ - Default mail spool directory
SCHEME=mbox - Default mailbox type
LOG_FACILITY=mail - Default syslog facility
IPV6 - IPv6 support
USE_LIBPAM - PAM support
HAVE_LIBLTDL - a portable `dlopen' wrapper library
WITH_GDBM - GNU DBM
WITH_GNUTLS - TLS support using GNU TLS
WITH_GSASL - SASL support using GNU SASL