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slow response on linux centos dual home nic on a load balancer down stream smtp solution is echo 2 > /proc/sys/net/ipv4/conf/eth0/rp_filter echo 2 > /proc/sys/net/ipv4/conf/eth1/rp_filter echo 2 > /proc/sys/net/ipv4/conf/eth2/rp_filter also modify /etc/sysctl.conf # Controls source route verification (previously 1) net.ipv4.conf.default.rp_filter = 2  source: https://www.centos.org/forums/viewtopic.php?t=7775

http://serverfault.com/questions/583372/postfix-transport-relay-access-denied/583438?noredirect=1#583438 virtual_mailbox_maps=/etc/postfix/virtual_mailbox_maps.txt ------------------------------------------------------- for clamd and amavis as scanner, if there is a clamav permission error add both clamd to amavis group or vice verse also check permission try 755

Task : to email old users that they have exceeded 100m disk space The problem is that the folder where the user is deep inside 2 folders so "du" is used. tr is used to remove characters cut to get the coloumn http://stackoverflow.com/questions/11049748/how-to-cut-multiple-columns-from-several-files-and-print-the-ouput-to-different   cd /backup/home/virtual du -m --max-depth=2  | tr './' ' ' | cut -d' '  -f 1,4 | while read space user do    if [ $space -gt 100 ]                     then         mail -s "Your account is using over 100MB Disk Space" $user <<MAIL  $user: You are now using $space MB in your home directory. The only total amount of diskspace allowed is 100 MB. MAIL  fi done