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MAILER.CONF(5) File Formats Manual MAILER.CONF(5)

configuration file for mailwrapper(8)

The file /etc/mailer.conf contains a series of pairs. The first member of each pair is the name of a program invoking mailwrapper(8) which is typically a symbolic link to /usr/sbin/sendmail. (On a typical system, newaliases(8) and mailq(8) would be set up this way.) The second member of each pair is the name of the program to actually execute when the first name is invoked. The file may also contain comments, denoted by a ‘#’ character in the first column of any line.


The following is an example of how to set up mailer.conf for the default smtpd(8) MTA suite:
# Emulate sendmail using smtpd 
sendmail	/usr/sbin/smtpctl 
send-mail	/usr/sbin/smtpctl 
mailq		/usr/sbin/smtpctl 
makemap 	/usr/sbin/smtpctl 
newaliases	/usr/sbin/smtpctl
This example shows how to invoke the traditional sendmail(8) MTA suite in place of smtpd(8):
# Execute the "real" sendmail program 
sendmail	/usr/local/libexec/sendmail/sendmail 
send-mail	/usr/local/libexec/sendmail/sendmail 
mailq		/usr/local/libexec/sendmail/sendmail 
makemap 	/usr/local/libexec/sendmail/makemap 
newaliases	/usr/local/libexec/sendmail/sendmail 
hoststat	/usr/local/libexec/sendmail/sendmail 
purgestat	/usr/local/libexec/sendmail/sendmail

mail(1), mailq(8), mailwrapper(8), newaliases(8), smtpd(8)

Perry E. Metzger <perry@piermont.com>

The entire reason this program exists is a crock. Instead, a command for how to submit mail should be standardized, and all the "behave differently if invoked with a different name" behavior of things like mailq(8) should go away.
September 17, 2018 OpenBSD-current