Short answer: Transactional email is the automatic emails your website sends — contact form submissions, order confirmations, password resets, that kind of thing. It’s a completely separate system from your regular Gmail or Outlook, it doesn’t work reliably out of the box, and getting it set up right is the difference between a contact form that works and one that loses you business.
This is one of those topics where the name alone makes people glaze over. “Transactional email” sounds like something only ecommerce companies need to think about. It’s not — it’s something every website with a form, a login, or any kind of automated email needs to deal with.
Let me explain what’s actually happening.
The two kinds of email your business sends
Your business sends two completely different kinds of email, even though they all look the same in your inbox:
The email you write yourself — replying to clients, sending invoices, reaching out to leads. This goes through Gmail, Outlook, or whatever email service you use. You hit “send,” it goes out, you don’t think about it.
The email your website sends automatically — when someone fills out your contact form, when a customer creates an account, when a password gets reset, when a booking gets confirmed. These are transactional emails. You didn’t write them — your website did, on your behalf, in response to something a visitor did.
These two kinds of email travel through completely different systems. And the second kind doesn’t work the way most people assume.
Why your website can’t just “send email” like you can
When you send an email from Gmail, Gmail handles all the behind-the-scenes work to make sure it actually arrives — proving it’s really from you, not a spammer pretending to be you. Email providers like Google and Microsoft have gotten extremely strict about this in the last few years, and rightly so. It cuts down on spam.
Your website, by default, doesn’t have any of that proof. So when it tries to send an email — say, forwarding a contact form submission to your inbox — the receiving email server takes one look at it and goes, “this looks suspicious.” And it does one of three things:
- Quietly drops it into a spam folder
- Blocks it entirely
- Lets it through, but flags it as untrustworthy
The worst part: your website thinks it sent the email successfully. There’s no error. There’s no warning. The form just submitted, the success message displayed, and the email never made it to you.
This is why “my contact form isn’t working” is one of the most common client emails I get — and almost every time, the form is working fine. The email just isn’t arriving.
The fix: a transactional email service
To make this work reliably, your website needs to send its emails through a service that’s specifically designed to handle transactional email. The big names are services like Postmark, SendGrid, MailerSend, Brevo, and a handful of others.
What these services do, in plain terms: they prove to the rest of the internet that your website is a legitimate sender, on your behalf. They handle all the technical authentication stuff (the alphabet soup of SPF, DKIM, DMARC — names you don’t need to remember). And they give you visibility into what’s actually being sent and whether it’s arriving.
Why this matters more than it sounds
A few real-world examples of why this isn’t optional:
- Lost leads. A contact form submission that lands in spam is a customer who tried to reach you and concluded you don’t return inquiries.
- Failed signups. If your site has logins, password resets, or account confirmations, and those emails don’t arrive, users can’t use your site.
- Failed orders. If you sell anything, missing order confirmations make customers think the transaction failed and reach out asking for refunds — or worse, dispute the charge.
- Damaged reputation. When your domain gets a reputation for sending poorly-authenticated email, all your email — including the stuff you write yourself — starts getting flagged. The problem spreads.
What I do about it
For every site I manage, I set up a proper transactional email service as part of the project. It’s not an upsell — it’s part of building a website that actually works. The service is yours, you own the account, and you can see exactly what it’s doing.
If you have an older site that I didn’t build, and you’ve ever wondered “why do contact form submissions sometimes not arrive,” this is almost certainly the reason.
