DomainKeys Identified Mail (DKIM) is a way to make an encrypted digital signature to your email. DKIM helps prevent email spoofing. Email spoofing is when spammers send email that looks like it’s coming from your email address. If your address is spoofed, your server could get flagged as a spam server and listed in email blacklists or DNSBL and RBL listed,you will have trouble sending legitimate mail.
Enabling DKIM and SPF should reduce the number of failed delivery notifications you receive when spammers forge messages from your domain. DKIM and SPF work to prevent spammers from forging messages that claim to be from your domain.
You may see this In order to ensure that SPF or DKIM takes effect, you must confirm that this server is an authoritative nameserver for “domain.com”. If you need help, contact your hosting provider. or Warning: cPanel is unable to verify that this server is an authoritative nameserver on your Authentication page after enabling KDIM and SPF , to solve the warning issue : you will have to manually add entries on the remote DNS server, or change the name servers for your domain name so the DNS is handled on the cPanel server. Or contact your hosting provider.
If you are hosting with Xsofthost.com you have to be sure that your are using the correct Nameservers that we provide it by default.
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