diff --git a/ssmtp_conf-sample/wanchecker.conf b/ssmtp_conf-sample/wanchecker.conf
index e5d7331..02c8d10 100644
--- a/ssmtp_conf-sample/wanchecker.conf
+++ b/ssmtp_conf-sample/wanchecker.conf
@@ -1,3 +1,6 @@
+# sSMTP executable path
+ssmtp_exec="/usr/bin/ssmtp"
+
 # Cache/Log directory of the script
 WANIP_DIR="/var/spool/mail"
 
diff --git a/ssmtp_conf-sample/wanchecker.sh b/ssmtp_conf-sample/wanchecker.sh
index 316b387..3cd13a2 100755
--- a/ssmtp_conf-sample/wanchecker.sh
+++ b/ssmtp_conf-sample/wanchecker.sh
@@ -237,13 +237,13 @@ function checkWANIP {
 
     local EMAIL_FORM="To: ${1}\nFrom: ${EMAIL_SENDER}\nSubject: ${SUBJECT_EMAIL}\n\n${MESSAGE_EMAIL}"
 
-    echo -e "${EMAIL_FORM}" | ssmtp -v "${1}"
+    echo -e "${EMAIL_FORM}" | ${ssmtp_exec} -v "${1}"
     if [[ $? -eq 0 ]]; then
       MAIL_SENT="OK"
     else
       if [[ -f "/usr/lib/libresolvconf-override.so" ]] && [[  $ENABLE_FALLBACK_DNS == 1 ]]; then
         SENDMAIL_PRELOAD="LD_PRELOAD=/usr/lib/libresolvconf-override.so $(resolvconfOverrideDNSList)"
-        echo -e "${EMAIL_FORM}" | $(eval ${SENDMAIL_PRELOAD} ssmtp -v "${1}")
+        echo -e "${EMAIL_FORM}" | $(eval ${SENDMAIL_PRELOAD} ${ssmtp_exec} -v "${1}")
         if [[ $? -eq 0 ]]; then
           MAIL_SENT="OK"
         fi