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How to add SPF records to an existing account(s) on a cPanel server
This article will show examples of how to add SPF records automatically to an existing customer(s) on your cPanel/WHM server.
Add SPF record for a single account
Add SPF record to all local accounts
cd /var/cpanel/users for u in *;do /usr/local/cpanel/bin/spf_installer $u; done