diff --git a/notify/sendmail.sh b/notify/sendmail.sh
new file mode 100644
index 0000000..3964e90
--- /dev/null
+++ b/notify/sendmail.sh
@@ -0,0 +1,59 @@
+#!/usr/bin/env sh
+
+#Support sendmail
+
+#SENDMAIL_BIN="sendmail"
+#SENDMAIL_FROM="yyyy@gmail.com"
+#SENDMAIL_TO="yyyy@gmail.com"
+
+sendmail_send() {
+  _subject="$1"
+  _content="$2"
+  _statusCode="$3" #0: success, 1: error 2($RENEW_SKIP): skipped
+  _debug "_subject" "$_subject"
+  _debug "_content" "$_content"
+  _debug "_statusCode" "$_statusCode"
+
+  SENDMAIL_BIN="${SENDMAIL_BIN:-$(_readaccountconf_mutable SENDMAIL_BIN)}"
+  if [ -z "$SENDMAIL_BIN" ]; then
+    SENDMAIL_BIN="sendmail"
+    _info "The SENDMAIL_BIN is not set, so use the default value: $SENDMAIL_BIN"
+  fi
+  if ! _exists "$SENDMAIL_BIN"; then
+    _err "Please install sendmail first."
+    return 1
+  fi
+  _saveaccountconf_mutable SENDMAIL_BIN "$SENDMAIL_BIN"
+
+  SENDMAIL_FROM="${SENDMAIL_FROM:-$(_readaccountconf_mutable SENDMAIL_FROM)}"
+  if [ -z "$SENDMAIL_FROM" ]; then
+    SENDMAIL_FROM="$USER@$HOSTNAME"
+    _info "The SENDMAIL_FROM is not set, so use the default value: $SENDMAIL_FROM"
+  fi
+  _saveaccountconf_mutable SENDMAIL_FROM "$SENDMAIL_FROM"
+
+  SENDMAIL_TO="${SENDMAIL_TO:-$(_readaccountconf_mutable SENDMAIL_TO)}"
+  if [ -z "$SENDMAIL_TO" ]; then
+    SENDMAIL_TO="$(_readaccountconf ACCOUNT_EMAIL)"
+    _info "The SENDMAIL_TO is not set, so use the account email: $SENDMAIL_TO"
+  fi
+  _saveaccountconf_mutable SENDMAIL_TO "$SENDMAIL_TO"
+
+  subject="=?UTF-8?B?$(echo "$_subject" | _base64)?="
+  error=$( { echo "From: $SENDMAIL_FROM
+To: $SENDMAIL_TO
+Subject: $subject
+Content-Type: text/plain; charset=utf-8
+
+$_content
+" | "$SENDMAIL_BIN" -f "$SENDMAIL_FROM" "$SENDMAIL_TO"; } 2>&1 )
+
+  if [ $? -ne 0 ]; then
+    _debug "sendmail send error."
+    _err "$error"
+    return 1
+  fi
+
+  _debug "sendmail send success."
+  return 0
+}