Set up SPF record to authenticate your sending domain

An SPF (Sender Policy Framework) record addresses a fundamental vulnerability in how email was originally designed — the core email protocol includes no built-in mechanism verifying that a message claiming to be from your domain actually originated from systems you control, meaning anyone can technically send email claiming to be from your domain without this record in place.

SPF closes this gap by publishing a DNS record explicitly listing which mail servers are authorized to send email on behalf of your domain — receiving mail servers can check incoming mail against this record, and messages claiming to be from your domain but originating from unlisted servers can be flagged as likely fraudulent or rejected outright.

Without a genuine, accurate SPF record, your domain remains vulnerable to email spoofing — attackers can send phishing or fraudulent messages that appear to come from your legitimate domain, potentially damaging your reputation and, more seriously, potentially deceiving your actual customers or contacts into trusting fraudulent communications.

The accuracy of this record deserves genuine, careful attention — an SPF record that's too restrictive can cause your own legitimate email to be incorrectly flagged or rejected by receiving servers, while one that's too permissive fails to provide meaningful spoofing protection, making accurate, complete listing of your actual legitimate sending sources essential to this record's genuine effectiveness.