If you’ve ever had to set up an email client, troubleshoot an email campaign that never arrived, or connect a tool to send emails through your domain, you’ve probably come across the term SMTP server. However, it is not something very commonly mentioned in marketing guides — let’s change that.
This guide breaks down what is SMTP, how it works, how it compares to other email protocols, and everything a Canadian email marketer should know about it.
An SMTP Guide for Canadian Marketers
What does SMTP mean?
SMTP stands for Simple Mail Transfer Protocol. It’s the standard communication protocol used to send emails from one server to another across the internet. The “simple” in the name refers to how it was designed: a lightweight, straightforward set of rules for transferring messages.
Despite that simplicity, SMTP is the foundation of email sending, from a one-person business sending a welcome email to an enterprise with millions of transactional messages per month.
SMTP is a sending protocol only. It basically tells servers how to pass an email from Point A to Point B. What happens after that email arrives — how you get it and read it — is handled by different protocols like IMAP and POP3 which we’ll explain more below).
What is an SMTP Server?
An SMTP server is the piece of infrastructure that processes and routes outgoing emails. When you send an email, your email client (Gmail, Outlook, Cyberimpact, Apple Mail, a CRM, etc.) hands that message off to an SMTP server, which takes care of getting it to the right destination.
Think of it like an online version of a post office. You drop off a letter (to your email client), the post office (the SMTP server) figures out the route, and it gets delivered.
Every email you send passes through an SMTP server. The difference is who operates that server: in some cases it’s a large provider like Google or Microsoft, in others it’s a dedicated service you’ve configured yourself.
How does an SMTP server work?
The SMTP protocol works through a series of exchanges between servers. Here’s what happens when you send an email:
1. Your email client connects to an SMTP server.
When you hit send, your client connects to your outgoing mail server using your SMTP settings (address, port, and credentials).
2. The SMTP server authenticates your identity
The server verifies that you’re authorized to send through it — this is why SMTP settings require a username and password.
3. Your server contacts the recipient’s server
Your SMTP server looks up the recipient’s domain (the part after the @ sign) and connects to their mail server to deliver the message.
4. The message is handed off
The receiving server accepts the email and places it in the recipient’s mailbox, where they can retrieve it using IMAP or POP3.
5. Confirmation (or failure)
If the delivery succeeds, the exchange ends. If the address doesn’t exist or there’s a problem, your server receives a bounce notification and returns an error message to you.
SMTP vs IMAP vs POP3: What’s the difference?
These three protocols are often mentioned together because they work as a system but each does its own thing. In summary, SMTP is for sending, IMAP and POP3 are for receiving.
| Protocol | Purpose | Storage | Multi-device |
|---|---|---|---|
| SMTP | Sends outgoing emails | N/A | N/A |
| IMAP | Receives and syncs emails | Stays on server | Yes |
| POP3 | Receives emails | Downloaded locally | Limited |
SMTP handles outgoing mail only. Every email you send goes through SMTP, regardless of which protocol you use to receive.
IMAP (Internet Message Access Protocol) is the standard for receiving email today. When you check your inbox, IMAP retrieves messages from the server and syncs them across all your devices. Delete a message on your phone, it disappears on your laptop too. It’s the reason modern email feels seamless across devices.
POP3 (Post Office Protocol 3) is an older receiving protocol. Rather than syncing, it downloads your emails to a single device and typically removes them from the server. It made more sense in an era of single-device email use. Today, IMAP has largely replaced it for most users.
SMTP server and email server are not the same thing
An email server is the full infrastructure that handles all aspects of email for a domain. It typically includes multiple components working together.
An SMTP server is just one part of that system, specifically responsible for sending outgoing mail. A complete email server also includes:
- An incoming mail server (handling IMAP or POP3)
- Storage for messages
- Security and filtering layers
How to find your SMTP server address
Where you look depends on who hosts your email:
For Gmail / Google Workspace: SMTP server: smtp.gmail.com | Port: 587 | Security: TLS
For Outlook / Microsoft 365: SMTP server: smtp.office365.com | Port: 587 | Security: TLS
For your web hosting provider (cPanel): Log in to your hosting control panel. Under “Email,” look for “Email Accounts” or “Configure Email Client” — the SMTP settings are usually listed there.
For a dedicated SMTP service (like Cyberimpact): Your provider will supply the server address in your account settings or documentation. With Cyberimpact’s SMTP service, the settings are available directly in your account dashboard.
What is an SMTP service — and do you need one?
A dedicated SMTP service is a third-party platform that provides SMTP infrastructure for sending email, usually at scale, with better deliverability than a standard email provider would offer.
Most personal and business email accounts come with basic SMTP capability. But that built-in SMTP has limits: sending volume caps, limited monitoring, and deliverability that deteriorates quickly if you’re sending bulk or transactional emails. A dedicated SMTP service provider fills that gap.
We recommend you use an SMTP server when:
- You’re sending transactional emails (order confirmations, password resets, notifications) through your application or website
- You want to improve deliverability for campaigns sent to very large contact lists
- You need detailed sending analytics, bounce tracking, and delivery reporting
- Your current setup is hitting high volume limits or landing in spam
- You want to send from your own domain with proper authentication (SPF, DKIM, DMARC)
Once you start sending campaigns or automated sequences to contacts, a dedicated SMTP service or email marketing platform with built-in SMTP service, like Cyberimpact, is important for your business growth.
SMTP and Email Marketing
Every email marketing campaign goes through SMTP, however, not all SMTP setups are equally suited to email marketing.
- Using a shared or personal SMTP server for bulk email is one of the fastest ways to get flagged as spam and jeopardize your deliverability. Dedicated SMTP email services help you maintain sender reputations and implement authentication to increase the likelihood of your emails reaching the recipients’ inboxes.
- Standard email accounts have sending limits. Marketing campaigns involve sending a large volume of emails in a short window and you need infrastructure built for that load so you don’t trigger safety protocols that will tag your emails as spam.
- Proper email marketing requires SPF, DKIM, and DMARC records to be configured. These authentication protocols certify that your emails are actually coming from your domain. A good SMTP email service handles or guides you through this setup.
- Marketing-focused SMTP services provide open tracking, click tracking, bounce management, and unsubscribe handling — data that basic SMTP servers won’t.
For Canadian businesses specifically, compliance with CASL (Canada’s Anti-Spam Legislation) adds another layer. The SMTP service you use should support proper unsubscribe mechanisms and consent management, not just delivery.
Mailchimp SMTP vs Cyberimpact SMTP
If you’re already doing email marketing and are now evaluating SMTP options for your business, it’s worth understanding how services differ. This is a comparison between SMTP services by Mailchimp, a U.S. email platform and Cyberimpact, the leading Canadian email marketing platform that specializes in data safety and compliance.
Mailchimp’s transactional email functionality operates through Mandrill, a separate add-on product with its own pricing. It’s not included in standard Mailchimp plans — you need to connect and pay for Mandrill separately.
The two products don’t fully integrate without some configuration work. For users who primarily need email marketing and want SMTP as a secondary feature, the added complexity and cost can be a friction point.
Cyberimpact’s SMTP service is built as part of the same platform — there’s no separate product to connect. All users get 1,000 email sends per month for free to test the service and can easily upgrade to higher volume tiers. Pricing is transparent, the setup is straightforward, and the service is designed specifically for the Canadian market with CASL compliance built-in.
Why use Cyberimpact’s SMTP service?
Cyberimpact is the leading Canadian email marketing platform, known for its commitment to compliance and data safety. Their SMTP service reflects that same approach: practical, reliable, and designed for Canadian organizations.
- Reliable delivery: Cyberimpact’s infrastructure is built for consistent deliverability, with monitoring and authentication support that keeps your sending reputation strong.
- Easy integration: Connect your website, CRM, or application using standard SMTP credentials. No complex configuration or separate product setup required.
- Scalable sending: Whether you’re sending a few hundred transactional emails a week or large batch campaigns, the infrastructure scales with your needs. Plus, you can start for free sending up to 1,000 emails per month in any Cyberimpact plan.
- CASL-ready compliance: For Canadian businesses, the combination of CASL-aligned list management and a built-in SMTP service means you’re not piecing together compliance across multiple tools.
- Bilingual support: As a Quebec-based company, Cyberimpact offers a fully bilingual platform and human support in both of Canada’s official languages.
Wrapping up
SMTP is the protocol that makes email sending possible. Understanding how it works — and choosing the right service to handle it — has a direct impact on whether your emails arrive, build trust, and drive action. For Canadian businesses, that means finding an SMTP service provider that pairs reliable delivery with the compliance requirements of operating in Canada.
If you’re ready to explore what Cyberimpact’s SMTP service can do for your sending, you can get started with a free account.
SMTP FAQ
What is an SMTP server in simple terms?
An SMTP server is the infrastructure that sends emails. When you hit send, your email is handed to an SMTP server, which routes and delivers it to the recipient’s mail server.
What does SMTP stand for?
SMTP stands for Simple Mail Transfer Protocol. It’s the standard protocol for sending email between servers.
What is the difference between SMTP and IMAP?
SMTP sends email. IMAP receives email and syncs it across your devices. Both protocols work together as part of your email setup, but they handle opposite sides of the process.
What is the difference between IMAP and POP3?
Both are receiving protocols. IMAP syncs email on the server so it’s accessible from multiple devices. POP3 downloads email to a single device and typically removes it from the server. IMAP is the standard for most users today.
What SMTP port should I use?
Port 587 with TLS encryption is the standard recommendation for authenticated email sending. Port 465 (SSL) is also used in some configurations. Port 25 is generally reserved for server-to-server relay and blocked by most internet providers.
Can I use Gmail’s SMTP server for marketing campaigns?
Not reliably. Gmail’s SMTP is designed for personal use and has strict sending limits. For marketing or transactional email at scale, use a dedicated SMTP service provider.
What is an SMTP service provider?
An SMTP service provider is a company that operates SMTP infrastructure you can use to send email from your own application, website, or platform — with better deliverability, monitoring, and scalability than standard email accounts offer.
How do I find my SMTP server address?
Check your email provider’s documentation or support pages. For Google Workspace, it’s smtp.gmail.com. For Microsoft 365, it’s smtp.office365.com. For dedicated services like Cyberimpact, your server address is listed in your account settings.
Is SMTP required for CASL compliance in Canada?
SMTP itself is a delivery protocol, not a compliance framework. But the service you use to send email should support CASL requirements — including proper unsubscribe mechanisms, consent tracking, and sender identification. Cyberimpact’s platform is built with these requirements in mind.