updated ezmlm-queue man page

ezmlm-x/ezmlm-queue.9

@@ -1,3 +1,4 @@
+.\" vim: tw=75
 .TH ezmlm-queue 1
 .SH NAME
 ezmlm-queue \- queue messages using qmail-qmqpc, qmail-multi or qmail-queue
@@ -14,14 +15,16 @@ environment variables using \fBenvdir\fR(8) using files in the directory
 to configure \fBqmail-qmqpc\fR(8), \fBqmail-multi\fR(8) or
 \fBqmail-queue\fR(8). You can use .\fIenvdir\fR and .\fIenvfile\fR to
 set additional environment variables. See \fBenvdir\fR(8) for more
-information.
+information. If \fISYSONFDIR\/ezmlm/global_vars\fR exists,
+\fBezmlm-queue\fR clears existing variables before setting new variables.
+The environment variables \fBEZMLM_ETC\fR, \fBEZMLMQUEUE\fR,
+\fBQMAILQUEUE\fR are restored to their original values if they don't exist
+in \fIglobal_vars\fR directory.
 
-\fBqmail-multi\fR(8) uses \fBQUEUE_BASE\fR, \fBQUEUE_START\fR and
-\fBQUEUE_COUNT\fR to use indimail-mta's multi-queue environment in
-QMAILHOME/queue directory.
-
-\fBqmail-queue\fR(8) uses \fBQUEUEDIR\fR, else it will use the
-default queue QMAILHOME/queue.
+\fBqmail-multi\fR(8) and \fBqmail-queue\fR(8) uses \fBQUEUE_BASE\fR,
+\fBQUEUE_START\fR and \fBQUEUE_COUNT\fR to use indimail-mta's multi-queue
+architecture in QMAILHOME/queue directory. \fBqmail-queue\fR(8) uses
+\fBQUEUEDIR\fR, else it will use the default queue QMAILHOME/queue.
 
 \fBqmail-qmqpc\fR(8) uses \fBPORT_QMQP\fR, \fBOUTGOINGIP\fR,
 \fBCONTROLDIR\fR environment variables.
@@ -30,15 +33,19 @@ default queue QMAILHOME/queue.
 present and uses \fBqmail-qmqpc\fR(8). if \fBqmqpservers\fR is absent, it
 will look for \fBqmail-multi\fR(8). If \fBezmlm-queue\fR doesn't find
 \fBqmail-multi\fR in /usr/sbin, it tries \fBqmail-queue\fR. It will exit
-with 111 exit code if it finds none of the three binaries.
+with exit code 111 if it finds none of the three binaries.
 
 Following programs use \fBezmlm-queue\fR(1).
 
 \fBezmlm-manage\fR(1), \fBezmlm-send\fR(1), \fBezmlm-warn\fR(1)
 
+The above programs too can use \fISYSCONFDIR/ezmlm/global_vars\fR. You can
+set environment variables for these programs in this directory.
+
 You can make the above program to use a different program instead of
-\fBezmlm-queue\fR(1), by setting \fBQMAILQUEUE\fR environment variable in
-SYSCONFDIR/ezmlm/global_vars.
+\fBezmlm-queue\fR(1), by setting \fBEZMLMQUEUE\fR or \fBQMAILQUEUE\fR
+environment variable. \fBEZMLMQUEUE\fR takes precedence over
+\fBQMAILQUEUE\fR environment variable.
 
 .SH "SEE ALSO"
 envdir(8),