Hosting Glossary
What is SPF?
SPF in plain English — the definition, the analogy, and why it matters to anyone who runs a website.
The short answer
SPF is a DNS-published list of servers authorised to send email for your domain — receivers check it to spot forged senders.
Below: the fuller explanation, an analogy that makes it stick, why it matters in practice, and where you'll actually meet it.
Written by the HostingAlly team · Last revised 27 July 2026
100+
Terms in this glossary
2 min
Average read
Plain
English, promised
24/7
Humans if you're stuck
One TXT record (exactly one) enumerates your legitimate sources — hosting mail, newsletter platform, CRM — via include mechanisms, ending in a policy marker (~all softfail, -all hardfail).
It authenticates the delivering server, not the message — which is why forwarding breaks it and DKIM exists as its cryptographic partner, with DMARC arbitrating over both.
SPF (Sender Policy Framework), by analogy
A published list of couriers authorised to deliver under your letterhead — recipients checking the list can spot vans that were never yours.
Hold onto that picture and most of the documentation you'll ever read about it becomes considerably less mysterious.
Why it matters to a site owner
Missing or broken SPF is the most common silent deliverability wound — receivers downgrade unauthenticated mail without telling anyone, and the fix is one carefully-audited DNS record.
That's the test for every technical term, incidentally — not 'do I understand it fully' but 'do I know when it's the answer to my problem'. For this one, now you do.
A concrete example
A firm's SPF authorises its hosting servers and its invoice platform — a spammer forging their domain from elsewhere fails the check at every competent receiver.
Multiply that example across every site on the internet and you have the concept's entire job description.
How this shows up in your hosting
On our hosting this mostly takes care of itself — the platform applies the sensible defaults, and the panel exposes the controls when you want them. The concepts worth knowing next: DKIM, DMARC, TXT Record and SMTP.
Renewal prices match signup prices, so the year-two invoice is the most boring email you'll get from us.
Why we wrote a hundred definitions
Every confusing term in hosting eventually becomes a support ticket — so we defined the hundred most common ones properly, once, in the plain English we'd use on the phone.
NVMe storage and LiteSpeed caching are standard here, not premium-tier extras.
- 100+ terms, plain English
- Analogies and real examples
- Cross-linked related concepts
- Written by the support desk
Why HostingAlly
Every plan includes this, whatever you pay
The practical stakes named
Not just what it is — when it's the answer to a problem you're having.
Grounded in a real platform
Examples reference the hosting you'd actually use, not abstract diagrams.
Analogies that stick
Each concept gets a picture you'll remember at the moment you actually need it.
Plain English first
Every term defined for site owners, not for other sysadmins — jargon translated, not restated.
Linked, not siloed
Related terms cross-reference, so one lookup becomes a working understanding.
The next reads, mapped
This entry connects to DKIM and DMARC — concepts travel in packs, and the pack is linked.
Getting Started
How to get going
- 1
Spot it in your own setup
The fastest way to learn a hosting term is to find it in your own panel — five minutes of looking beats an hour of reading.
- 2
Check the defaults
Our platform ships sane defaults for this — verify rather than assume, and you'll know your setup instead of hoping about it.
- 3
Follow the related terms
Concepts travel in packs — DKIM, DMARC and TXT Record complete this one's picture, and each is a two-minute read away.
Included
What's covered on our plans
- Spam and virus filtering on every mailbox
- LiteSpeed server-level caching
- Free WebP image optimisation built in
- Free domain for the first year on annual plans
- Email accounts on your own domain
- DDoS protection at the network level
- Free SSL certificate on every plan, renewed automatically
- SSH, Git and Composer access on developer-friendly plans
- Free website migration handled by our team
- Upgrades apply in place — no migrations between plans
FAQ
Your questions, answered
Why must there be only one SPF record?
The standard says so — two SPF records don't merge, they invalidate each other, and receivers treat the domain as having broken SPF. New services get added into the existing record, never as a sibling.
What do ~all and -all mean at the end?
The failure policy: ~all suggests softfail (mark suspicious), -all asserts hardfail (reject). Start soft while auditing your senders; harden once DKIM and DMARC monitoring confirm the list is complete.
How do I pay, and is billing recurring?
Plans are billed by credit or debit card through our secure checkout, with the renewal price matching the signup price. You can see every invoice in the client area, and cancelling auto-renewal is a setting, not a phone call.
What happens to my data if I cancel?
Your site and files remain yours — download a full backup from the panel any time, before or during cancellation. Domains stay registered to you for their paid term and can transfer to any registrar after the standard 60-day window.
Can I transfer a domain I already own?
Yes — transfers in are routine: unlock the domain at the current registrar, grab the auth code, and start the transfer from your client area. The remaining registration time carries over, and DNS keeps working throughout.
Do prices go up at renewal?
No — the price you sign up at is the price you renew at. We don't run teaser-rate economics, so there's no year-two ambush to plan around, and your bookkeeping can rely on the number staying put.
What happens if I outgrow my plan?
You upgrade in place — plan changes apply from your client area without migrations or downtime, and our range runs from small shared plans through VPS to dedicated servers, so growth is an account change rather than a new-host project.
Keep exploring
SMTP
SMTP is the protocol that sends email — from your client to your mail server, and between servers across the internet.
DMARC
DMARC is the policy layer over SPF and DKIM — telling receivers what to do with mail that fails authentication, and reporting what they saw.
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The steps that keep a site migration dull rather than dramatic: what to back up first, how to shift email across without losing a single message, when to touch DNS, and the two mistakes behind nearly every hour of downtime we come across.
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