What is SPF and how to check it
SPF tells the world which servers are allowed to send email for your domain — a first line of defence against spammers forging your address.
What it is
SPF (Sender Policy Framework) is a single DNS TXT record listing the servers permitted to send mail as your domain. It looks likev=spf1 include:_spf.google.com ~all.Receiving mail servers read it and check whether the sending server is on your approved list.
Why it matters
Without SPF, anyone can forge the “From” on your domain, and your legitimate mail is more likely to land in spam. SPF is also a prerequisite for getting full value from DMARC.
How to check
Enter your domain in the tool above. It finds your SPF record, checks the syntax, and flags common issues like a missing record or too many DNS lookups.
How to fix
- Publish one TXT record starting with
v=spf1that includes every sender you use (your host, Google/Microsoft, marketing tools). - End with
~all(soft-fail) or-all(hard-fail) once you're confident. - Keep to one SPF record and under 10 DNS lookups.