Key points
- SPF lists which servers may send mail for your domain
- Missing/wrong SPF = mail lands in spam
- One SPF record per domain (multiple breaks it)
- SPF alone isn't enough — pair with DKIM + DMARC
How to do it
- Identify your sending servers (mail provider, marketing tools)
- Build the SPF record (include: + ip4: etc.)
- Publish as a TXT record at your domain
- Verify with a DNS lookup tool
Common mistakes
- More than one SPF record
- Exceeding the 10-lookup limit
- Not including all legitimate senders
Automated SPF setup — freeNo card required — free forever up to 10 mailboxes.