Sender Policy Framework, or SPF, is a verification system, that is used to prevent the so-called e-mail spoofing where an e-mail message is sent from one email address, but to appear as being sent from a different, often with the idea to fraud the recipient someway. If SPF protection is activated for a domain, a specific record is generated for it in the Domain Name System and all of the DNS servers worldwide have it. The record features all the e-mail servers that are permitted to send valid messages from an address part of the domain. When an email is sent, the first DNS server it goes to verifies the SPF record and in case the sending server is authorized, the message is sent to the target receiver. In case, however, the sending server doesn't exist in the SPF record for the given domain, the e-mail message will not be forwarded and it'll be discarded. Whenever you use this solution, it'll prevent third parties from sending spam messages which seem to have been sent by you.
SPF Protection in Shared Hosting
When you host your domain names in a shared hosting account on our end and we manage the e-mail addresses for them, you are able to activate SPF protection for them with several clicks in your Hepsia Control Panel. This service is available in a separate section where you will be able to see which domain names are already protected. For the ones that aren't, you will be able to activate the SPF protection service and set up numerous things during the process - the hostnames of the mail servers that are allowed to send messages from your emails, the IPv4 and IPv6 addresses of these servers, and to set a rule that messages can be sent only when your domain names use our MX records. The last mentioned solution is the most secure one, but it can be used when we manage the e-mail addresses for your domain names and you are not using a different e-mail supplier. The newly created records will propagate within 24 hours and nobody will be able to forge the FROM field in an e-mail with your e-mail addresses.