Enabling SPF for all accounts in WHM

Command to install spf record on single cPanel account :  
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/usr/local/cpanel/bin/spf_installer <cPanelusername>


Install spf records for all cPanel accounts :
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cd /var/cpanel/users

for i in `ls /var/cpanel/users` ;do /usr/local/cpanel/bin/spf_installer $i ;done