use msmtp for standardized syntax

mail2mms.sh

@@ -65,12 +65,13 @@ while true; do
 
   # If the number of new mails has increased  
   if [ ${newnew} -gt ${oldnew} ]; then
-    echo "$(summary)" \
+    echo "From: ${addr}
-    | mail -r ${addr} \
+To: ${phone}
-      -s "new mail [${newnew}]" \
+Subject: new mail [${newnew}]
-      ${phone}
+
+$(summary)" | msmtp -t --read-envelope-from
   fi
 
   oldnew=${newnew}
-  sleep 10m
+  sleep 600
 done