Remote host said: 554 Message not allowed

the message  received from yahoo mail got error  message " Remote host said: 554 Message not allowed - [299]"

it's mean yahoo detect character in your mail that considered danger
my isue  in the  script i put the option character like this bellow

#/bin/msmtp -- examplexxxx@gmail.com << EOF

after  remove it  the email send succesfuly to yahoo mail

just remove the character that not required

linux failover internet with auto change default gateway

this bellow is simple auto change default gateway for internet

i have two isp internet :
server  with gateway : 192.168.1.17
server  with backup gateway : 192.168.1.59
use proxy for default internet in officce that run script auto cahange gateway

first use the default gateway is 192.168.1.17
i use the google's dns ( 8.8.8.8 ) for test internet connection  via gateway 192.168.1.17 every  3 minute with crontab  do with swroute.sh

second use route host google's dns via 192.168.1.17
#route add -host 8.8.8.8  gw 192.168.1.17

and the second isp ( 192.168.1.59 ) for backup internet do with swroute.sh

                                      

sometime we need network similar with this network

i use ping for test internet connection  for first isp ( 192.168.1.17 )
and i create swroute.sh  with  bash script  for test connection and switch default default routing

#nano  swroute.sh
-------------------------------------------------------------------------------------------------------------------------
#!/bin/bash
loss="`ping 8.8.8.8 -w 20 | grep loss | awk '{print $6}' | sed '$s/.$//'`"         
route="`route -n  | head -3 | grep eth0 | awk '{print $2}'`"                           
isp1="192.168.1.17"                                                                                             isp2="192.168.1.59"                                                                                          
                                                                                                            
if [ $route == $isp1 ];
    then                                                                                  
        if [ $loss -gt 15 ]                                                                                 
           then                                                                                             
              route del default gw 192.168.1.17                                                           
              route add default gw 192.168.1.59                                                          
              echo "line via isp2---   pada: `date`" >>  /root/ping/logswitch.txt
           else            
                echo "still via isp1 "                                                                       
         fi                                                                                                  
elif  [ $loss -gt 15 ];
        then echo " still via isp2"
        else
                route add default gw 192.168.1.17
                route del default gw 192.168.1.59
                echo "> back to isp1 : `date`" >> /root/ping/logswitch.txt
fi

------------------------------------------------------------------------------------------------------------------------

#chmod +x  swroute.sh

add crontab every 3 minute
*/3 * * * * /path/path/swroute.sh


this script work for my slackware server
Happy  Slackware .....