diff --git a/mcom b/mcom
index d60070e..fb48401 100755
--- a/mcom
+++ b/mcom
@@ -321,7 +321,10 @@ fi
 		) fi
 		;;
 	*mbnc*)
+		old_ifs="$IFS"
+		IFS=$NL
 		set -- $(mseq -- "$@")
+		IFS="$old_ifs"
 		if [ "$#" -ne 1 ]; then
 			printf 'mbnc: needs exactly one mail to bounce\n' 1>&2
 			exit 1
@@ -344,7 +347,10 @@ fi
 		)
 		;;
 	*mrep*)
+		old_ifs="$IFS"
+		IFS=$NL
 		set -- $(mseq -- "$@")
+		IFS="$old_ifs"
 		if [ "$#" -ne 1 ]; then
 			printf 'mrep: needs exactly one mail to reply to\n' 1>&2
 			exit 1