Hosting Terms
What is SMTP?
SMTP in plain English — the meaning, the comparison, and why it matters to anybody running a website.
Straight answer first
SMTP is the protocol that sends email — from your mail app to your mail server, and from there between servers across the internet.
Below: the fuller explanation, a picture that makes it stick, why it matters in practice, and where you will actually run into it.
Written by the Hosting Seller staff · Checked 1 August 2026
0
Terms left unexplained
100+
Definitions, cross-linked
Real
Examples from real kit
Free
To read, naturally
IMAP and POP are about reading; SMTP is about dispatch. Legitimate mail enters the system through authenticated submission, meaning your credentials over an encrypted port. That is why 'I can receive but I cannot send' is almost always an SMTP setting rather than a broken mailbox.
It is also the layer where deliverability is decided. The reputation of the sending server, whether SPF lines up, and how your volume behaves over time all shape whether receivers trust what SMTP hands them.
SMTP, by comparison
The outbound side of the post office: collection, sorting and the vans running between depots. Opening and reading what arrives is an entirely separate counter.
Comparisons simplify, naturally — but this one holds together well enough to reason with, and reasoning is the whole point of a glossary.
What it means for your own site
Every form notification, order receipt and customer reply travels over SMTP. Setting it up properly — authentication on, the right server, WordPress routed through it rather than left to guess — is the difference between mail that lands and mail that quietly disappears.
That is the test for any technical term, incidentally — not 'do I understand it fully' but 'do I know when it is the answer to my problem'. For this one, you now do.
What it looks like day to day
A WordPress site's SMTP plugin sends order emails through a real authenticated mailbox. Receipts that PHP's mail() used to lose in spam folders now arrive, with headers that pass SPF and DKIM on the way in.
Perfectly ordinary once you have seen it, which is rather the point: most hosting concepts are simple machinery wearing an intimidating name.
Where you will meet it on our platform
You will meet it in the control panel and occasionally in a support conversation, usually already set the right way. If this term made sense, the natural next reads are IMAP, SPF, DKIM and MX Record.
Order an annual plan and the first year of your domain registration is on the house.
A glossary written by the people on the counter
We treat unexplained jargon as a service failure. This glossary is the support desk's accumulated translations, published where a search engine can hand them out for us.
SSL comes free with every plan and reissues itself before it lapses, so nobody has to diary the padlock.
- 100+ terms, all in plain English
- Everyday comparisons and real examples
- Related concepts linked together
- Written by the people on the desk
Why Hosting Seller
On every plan, as standard
One term, fully landed
SMTP defined, pictured by comparison and placed in your own control panel — recognise-level in a single read.
Pictures that stick
Each concept gets a comparison you will still remember at the moment you actually need it.
Linked, never siloed
Related terms cross-reference each other, so one lookup grows into a working understanding.
Honest about what to skip
Most terms are recognise-level rather than operate-level, and the glossary says which is which.
The next reads, mapped
Read on into IMAP and SPF — terms rarely stand alone, so the neighbours are linked.
Plain English first
Every term defined for people who run sites, not for other sysadmins — jargon translated rather than restated.
First Steps
From choosing to live
- 1
Find it in your own account
Open the control panel and find where this concept lives — seeing it attached to your own site is what turns a definition into understanding.
- 2
Check what the defaults are
Our platform ships sensible defaults for this — check rather than assume, and you will know your setup instead of hoping about it.
- 3
Follow the terms next door
Concepts travel in packs — IMAP, SPF and DKIM finish this one's picture, and each is a two-minute read away.
In the Box
Packed with every plan
- LiteSpeed caching running at the server, not bolted on by plugin
- WebP image optimisation built in and costing nothing
- Site migration done for you by our staff, at no charge
- PHP versions picked per site from the panel
- Mailboxes that carry your own domain name
- A backup taken daily, with restores you run yourself
- SSH, Git and Composer on the plans built for developers
- A free SSL certificate on every plan, reissued before it lapses
- Real people on the counter, every hour of every day
- cPanel, the panel the rest of the trade already knows
Across the Counter
The questions we get asked most
Why can I receive mail but not send it?
Outgoing authentication, nine times in ten. The mail app needs your credentials enabled for the outgoing server — that unticked box — the right port, usually 465 or 587 with encryption, and your full email address as the username. That trio fixes nearly every case.
Can I run a newsletter through my hosting's SMTP server?
Small runs are fine; campaigns are not. Hosting mail carries sending limits and a shared reputation that bulk traffic damages for everyone on it. Newsletters belong with an email service provider. Hosting SMTP is for correspondence and site notifications.
What uptime do you commit to, and who is watching?
We commit to 99.9% uptime and watch it continuously. That figure is an operational target rather than a poster line, and the alerting behind it usually has an engineer on a problem before the first customer notices anything is wrong.
Which control panel comes with the account?
cPanel, which the whole trade already knows. That means every tutorial online matches what you see, your backups restore onto any cPanel host anywhere, and what you learn here stays useful for life. Plesk and DirectAdmin are stocked on specific plans for anyone who prefers them.
Is there a refund if it does not suit?
Yes — thirty days. Put the hosting through real work, and if it is not right, ask for the money back and you get it; there is no retention script to survive first. Domain registrations are the one carve-out, because registries take that fee the moment the name is placed.
Where do the servers actually sit?
Our hosting runs from European datacentres with London at the centre, behind server-level caching that keeps cached pages quick for visitors anywhere. For most sites the build of the platform — NVMe disks, LiteSpeed, sensible numbers of accounts per machine — decides the speed far more than the postcode does.
How do I read the mail when I am away from the desk?
Webmail opens in any browser, and every mailbox also speaks IMAP, POP and SMTP — so the mail app on your phone, the client on your desktop and webmail all show the same messages in the same order.
Read next
SPF (Sender Policy Framework)
SPF is a DNS record listing the mail servers allowed to send on behalf of your domain, so a receiver can sp…
MX Record
An MX record names the mail servers that accept email for your domain, with priority numbers setting the or…
Domain Names
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