Definition
Sender Policy Framework (SPF) allows domain owners to specify which mail servers are permitted to send email on their behalf. Receiving servers check the SPF record to verify that incoming mail comes from an authorised source. Mail from unauthorised servers may be rejected or marked as spam.
Record Format
An SPF record is a TXT record published at your domain root. A typical record looks like:
v=spf1 include:_spf.your-esp.com include:mail.yourdomain.com ~all
Key Components
v=spf1: Version identifier — always requiredinclude:: Authorises another domain's SPF record (used for ESPs)ip4:andip6:: Authorises specific IP addresses or rangesa:andmx: Authorises your domain's A and MX records~all: Soft fail — mail from unauthorised servers is marked but not rejected-all: Hard fail — mail from unauthorised servers is rejected
Common Mistakes
Exceeding the 10-DNS-lookup limit (SPF has a hard limit of 10 lookups per evaluation). Having multiple SPF records (only one is allowed — the rest are ignored). Forgetting to include your ESP's sending infrastructure.
Why It Matters
This matters because the choices you make here show up directly in your results. Mail from unauthorised servers may be rejected or marked as spam. When this is handled well it supports engagement, delivery, and the trust subscribers place in your brand; when it is neglected, the effects tend to show up in declining performance and harder-to-fix problems further down the line.
Best Practices
- Start with the fundamentals of Email SPF Record Setup and build from a clear baseline, so later improvements are measurable rather than assumed.
- Keep Email SPF Record Setup consistent with how the rest of your email programme works, so no single initiative works against another.
- Review how Email SPF Record Setup is handled in your own data and adjust from what you see, rather than copying what another brand does.
- Test one change at a time and measure the effect before rolling it out more widely.
- Revisit your approach to Email SPF Record Setup regularly, because audience behaviour and inbox technology keep moving.
- Make sure the basics — relevance, timing, and honesty — are solid before chasing more advanced tactics.
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Frequently Asked Questions
Good practice here means handling Email SPF Record Setup in a way that is relevant, timely, and honest for your audience. SPF record setup involves publishing a DNS TXT record that lists all servers authorised to send email from your domain, preventing spoofing and improving deliverability. Done well, it improves engagement and builds trust; done poorly, it creates friction that costs you results.
Because it touches the parts of email that drive outcomes: relevance, trust, and delivery. Small improvements compound, while repeated mistakes quietly erode the health of your programme.
The most common problems are treating Email SPF Record Setup as a one-off task, ignoring what the data says, and copying competitors without testing. All three lead to effort that does not translate into better results.
Compare the metrics it should influence — engagement, conversions, and deliverability — before and after you make changes. Trends over time matter far more than any single send.
It supports the same goal as the rest of your email programme: the right message to the right person at the right time. Aligned with segmentation and automation, it reinforces everything else rather than competing with it.