This is quite common because the vast majority of ‘spoof’ emails are known to be spam by most email platforms, meaning most if not all mails will never be delivered to the intended recipient and will instead generate a ‘Non-delivery report’.
Adding an SPF record can help prevent others from spoofing your domain. These records won’t necessarily be the same as your mail provider or server would be different to another. For example, Office365 provides you with the record to add. You would then need to add it to your DNS zone.
The first step would be to login to your cPanel and select the “Advanced Zone Editor”
You will notice at the top of the new page that there is a section to add your DNS record. Change the type to “TXT” and fill in the required fields. If you have multiple domains added to your hosting package then please ensure that you select the correct one before adding the DNS record.
Name will be what you decide to call your record.
You can keep the TTL (time to live) the same as the others that has already been created if you were not given one.
TXT Data is the “rule” that you wish to apply.
For example, if your organization uses only MS Office 365 and you do not have local mail servers, your SPF record should look like this:
If you are required to add an SPF record for a domain whose emails are being hosted here then this record can be used:
v=spf1 a mx include:relay.mailchannels.net ?all
Please keep in mind that if the domain’s name servers are being pointed elsewhere, the update will need to be done on that system.