diff --git a/check-postfix.sh b/check-postfix.sh
index f6782e3..07d2599 100755
--- a/check-postfix.sh
+++ b/check-postfix.sh
@@ -64,6 +64,7 @@ do_emergency_email () {
 	MAILSERVER=`dig $DOMAIN mx | grep -Eo '[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+' | head -n 1`
 
 	## Setting up coprocess to send commands to telnet session coproc TELNET { telnet $MAILSERVER 25; }
+	coproc TELNET { telnet $MAILSERVER 25; }
 
 	## Commands to send email manually
 	local -a commands=(