diff -ur munin-2.0.42.orig/plugins/node.d/postfix_mailqueue.in munin-2.0.42/plugins/node.d/postfix_mailqueue.in
--- munin-2.0.42.orig/plugins/node.d/postfix_mailqueue.in 2018-09-21 05:11:11.000000000 +0300
+++ munin-2.0.42/plugins/node.d/postfix_mailqueue.in 2018-09-30 13:33:21.825373214 +0300
@@ -103,7 +103,7 @@
cat <<'EOF'
graph_title Postfix Mailqueue
graph_vlabel Mails in queue
-graph_category postfix
+graph_category mail
graph_total Total
active.label active
deferred.label deferred
diff -ur munin-2.0.42.orig/plugins/node.d/postfix_mailstats.in munin-2.0.42/plugins/node.d/postfix_mailstats.in
--- munin-2.0.42.orig/plugins/node.d/postfix_mailstats.in 2018-09-21 05:11:11.000000000 +0300
+++ munin-2.0.42/plugins/node.d/postfix_mailstats.in 2018-09-30 13:33:14.492320072 +0300
@@ -141,7 +141,7 @@
print "graph_vlabel mails / \${graph_period}\n";
print "graph_scale no\n";
print "graph_total Total\n";
- print "graph_category postfix\n";
+ print "graph_category mail\n";
print "graph_period minute\n";
print "delivered.label delivered\n";
print "delivered.type DERIVE\n";
diff -ur munin-2.0.42.orig/plugins/node.d/postfix_mailvolume.in munin-2.0.42/plugins/node.d/postfix_mailvolume.in
--- munin-2.0.42.orig/plugins/node.d/postfix_mailvolume.in 2018-09-21 05:11:11.000000000 +0300
+++ munin-2.0.42/plugins/node.d/postfix_mailvolume.in 2018-09-30 13:33:06.602262890 +0300
@@ -133,7 +133,7 @@
print "graph_args --base 1000 -l 0\n";
print "graph_vlabel bytes / \${graph_period}\n";
print "graph_scale yes\n";
- print "graph_category postfix\n";
+ print "graph_category mail\n";
print "volume.label delivered volume\n";
print "volume.type DERIVE\n";
print "volume.min 0\n";