Email Fundamentals

What is SMTP? A plain-English guide for non-developers

SMTP sounds intimidating. It is not. Connecting a sending server to your email platform takes under two minutes and requires zero coding.

Updated September 2026 · 6 min read

If you have looked at email marketing platforms that let you bring your own sending server, you have probably seen the word SMTP and felt a small wave of anxiety. That is completely understandable — it sounds like something a developer should handle.

It is not. SMTP is just a delivery method. Connecting it takes four copy-pasted values and about 90 seconds of your time. This guide explains what it is, why it matters, and exactly how to set it up.

What SMTP actually is

SMTP stands for Simple Mail Transfer Protocol. It is the standard way computers send email to each other — the same protocol your Gmail account uses behind the scenes when you hit Send.

When you use an email marketing platform, every email you send has to travel from the platform to your subscribers inboxes. SMTP is the road those emails travel on. The platform needs to know which road to use — that is, which email infrastructure provider will actually deliver your messages.

The simple version: SMTP is just a delivery address. You tell your email platform "send my emails through SendGrid" (or Mailgun, or Amazon SES), and you do that by providing four pieces of information: a host, a port, a username, and a password.

Why platforms ask you to bring your own

Some email platforms — like Mailchimp or Klaviyo — handle delivery for you. You never see the word SMTP. That sounds convenient, but it comes at a cost: you pay a premium for their infrastructure, you share reputation with thousands of other senders, and you have less control over your deliverability.

Platforms like Aledamail use a BYOS (Bring Your Own Sending Server) model. You connect your own account at an email infrastructure provider — SendGrid, Mailgun, or Amazon SES — and send through that. You own the sending reputation. You pay the infrastructure provider directly, usually at a fraction of what bundled platforms charge.

Bundled platforms (Mailchimp, Klaviyo)

Infrastructure included but expensive. You share sending reputation with other customers. Less control over deliverability. Costs scale steeply with list size.

BYOS platforms (Aledamail)

You connect your own SendGrid, Mailgun, or SES account. You own your sending reputation. Infrastructure costs are a fraction of bundled plans. Full control.

The four things you need to connect SMTP

When Aledamail asks you to connect a sending server, it needs four values. Every major provider gives you these in their dashboard:

That is it. No code. No server configuration. Just copy those four values from your provider's dashboard and paste them into Aledamail.

How to connect a sending server in Aledamail

1

Create an account with a sending provider

Sign up for SendGrid, Mailgun, or Amazon SES. All three have free tiers that are more than enough to get started. SendGrid's free plan covers 100 emails per day with no credit card required.

2

Find your SMTP credentials

In your provider's dashboard, look for SMTP settings or API keys. For SendGrid: Settings → API Keys → Create. For Mailgun: Sending → Domains → SMTP credentials. Copy the host, port, username, and password or key.

3

Add the sending server in Aledamail

Go to Sending Servers → Add New → choose your provider type → paste in the four values. Aledamail will test the connection automatically and confirm it works.

4

Assign it to your list and send

Go to your mailing list settings and select the sending server you just connected. Every campaign sent to that list will now go through your own infrastructure.

Which sending provider should you choose?

SendGrid

Easiest to set up. Generous free tier. Great deliverability. Best starting point for most users.

Free up to 100/day · from $19.95/mo

Mailgun

Developer-friendly with strong API. Good for transactional email. Slightly more setup than SendGrid.

Free trial · from $15/mo

Amazon SES

Lowest cost per email at scale. Requires an AWS account. Best value for high-volume senders.

$0.10 per 1,000 emails

If you are just getting started, go with SendGrid. The free tier is enough to test everything, the dashboard is straightforward, and the deliverability is strong out of the box.

What about deliverability?

One concern people have with BYOS is whether their emails will actually land in the inbox. The good news: using your own sending server often improves deliverability compared to shared infrastructure, because you are not affected by what other senders on the same IP do.

To get the best deliverability from your sending server, make sure you have set up SPF, DKIM, and DMARC — the three email authentication standards that inbox providers use to trust your mail. Aledamail walks you through all three during setup. For a deeper explanation, read our guide on SPF, DKIM, and DMARC explained.

Frequently asked questions

Do I need technical knowledge to connect SMTP?

No. If you can copy and paste, you can connect a sending server. The process takes under two minutes and Aledamail tests the connection automatically so you know immediately if something is wrong.

Can I use my existing SendGrid account?

Yes. If you already have a SendGrid, Mailgun, or Amazon SES account, you can connect it directly. There is no need to create a new one.

What if the connection test fails?

The most common issue is a wrong port number or a copy-paste error in the API key. Double-check the four values against your provider's dashboard. If you are still stuck, email us at hello@aledamail.com and we will help you sort it out.

Is BYOS right for everyone?

BYOS works best for senders who want control over their costs and deliverability. If you send fewer than 500 emails per month, a bundled platform might be simpler. For everyone sending more than that regularly, BYOS almost always works out cheaper and gives you better long-term deliverability.

Ready to try it?

Create a free Aledamail account, connect your sending server in under two minutes, and send your first campaign today. No credit card required.

Start free →