How to create the spf records for my domain? We have several tutorials to give you more information about this setting.
Please start with this...

Can I configure the spf records using Cpanel? The best way to add the spf records, if you don't know how to manage your DNS settings, is to...

How can I create an SPF record for Mailrelay? If you don't have technical knowledge to add this setting, please reade this tutorial where you...