You know that moment when a client finally says yes to running email campaigns?
Beautiful.
The offer is dialed.
The list is ready.
The automation is built.
Then the emails start bouncing, deliverability tanks, replies do not come through cleanly, and suddenly the “simple campaign” turns into a technical fire drill.
That is the part most agencies underestimate.
Email is not just copy and campaigns, it’s infrastructure.
If the sending foundation is weak, everything built on top of it gets shaky fast.
That is where Mailgun comes in.
Mailgun is the email delivery engine that helps power bulk sending inside HighLevel.
Think of it like the behind-the-scenes delivery system that gets your emails out the door at scale.
HighLevel uses Mailgun for email in a similar way it uses Twilio for text messages and phone calls.
For newer onboarding agencies, LC Email is used by default, and that lives under HighLevel’s Mailgun account.
But once you start thinking like an operator, you need to understand what Mailgun does, how it is priced, and what domain setup makes the most sense for your agency and clients.
Let’s break it down.
What Is Mailgun in HighLevel?
Mailgun is a third-party email delivery service used for bulk email sending.
That means when you send larger volumes of emails through HighLevel, Mailgun helps handle the delivery infrastructure behind the scenes.
This matters because email sending is not something you want to treat casually.
Bad setup creates bad deliverability.
Bad deliverability creates missed opportunities.
Missed opportunities create unhappy clients.
And unhappy clients create churn.
Mailgun gives agencies a more reliable way to send bulk email through dedicated email infrastructure.
It also allows you to use branded sending domains or subdomains so the emails look professional and aligned with the business sending them.
That is a big deal.
Nobody wants client emails looking random, disconnected, or technically sloppy.
Why Agencies Use Mailgun With HighLevel
Here is the win.
Mailgun gives you more control over the email sending environment.
You can send larger volumes of email through a reputable delivery system.
You can use your own domain or subdomains for more professional branding.
You can choose between one shared agency subdomain or multiple client-specific subdomains.
You can also improve deliverability by properly configuring DNS and MX records.
That last part matters a lot.
Because when email deliverability goes wrong, people usually blame the campaign.
But a lot of the time, the real issue is the setup underneath it.
The list quality matters.
The sending reputation matters.
The domain structure matters.
The DNS records matter.
This is the boring stuff that makes the exciting stuff work.
How Much Does Mailgun Cost?
Mailgun has multiple plan options.
The Basic plan starts at $15 per month.
The Foundation plan starts at $35 per month.
The Scale plan starts at $90 per month.
Your choice depends on your sending volume, your agency model, and how much infrastructure control you want.
Do not overcomplicate this too early.
But do not ignore it either.
If email is part of the service you sell, email delivery is part of the product.
What Domain Should You Use?
In most cases, you should use a subdomain for Mailgun.
A common setup would look like mg.mydomain.com.
That keeps the sending infrastructure organized while still allowing you to send from your root domain, like you@mydomain.com.
This is the clean way to do it.
If you use a subdomain, make sure you configure the MX records for that subdomain inside your Mailgun account.
That helps with optimal delivery.
You can only add domains you actually own.
Mailgun will require you to update the domain’s DNS records so you can verify that you are authorized to send from that domain.
This is not optional.
It is how Mailgun confirms you are not trying to send email from a domain you do not control.
The Big Agency Win
Mailgun is not just another technical setting inside HighLevel.
It is part of your email delivery foundation.
When it is set up correctly, your agency gets more reliable bulk sending, cleaner branding, and better control over deliverability.
That means fewer fires.
Cleaner campaigns.
Happier clients.
And more confidence when you scale email across accounts.
Frequently Asked Questions
What Is Mailgun in HighLevel?
Mailgun is a third-party email delivery service used for bulk email sending. That means when you send larger volumes of emails through HighLevel, Mailgun helps handle the delivery infrastructure behind the scenes. This matters because email sending is not something you want to treat casually. Bad setup creates bad deliverability. Bad deliverability creates missed opportunities. Missed opportunities create unhappy clients. And unhappy clients create churn. Mailgun gives agencies a more reliable way to send bulk email through dedicated email infrastructure. It also allows you to use branded sending domains or subdomains so the emails look professional and aligned with the business sending them. That is a big deal. Nobody wants client emails looking random, disconnected, or technically sloppy.
How Much Does Mailgun Cost?
Mailgun has multiple plan options. The Basic plan starts at $15 per month. The Foundation plan starts at $35 per month. The Scale plan starts at $90 per month. Your choice depends on your sending volume, your agency model, and how much infrastructure control you want. Do not overcomplicate this too early. But do not ignore it either. If email is part of the service you sell, email delivery is part of the product.
What Domain Should You Use?
In most cases, you should use a subdomain for Mailgun. A common setup would look like mg.mydomain.com. That keeps the sending infrastructure organized while still allowing you to send from your root domain, like you@mydomain.com. This is the clean way to do it. If you use a subdomain, make sure you configure the MX records for that subdomain inside your Mailgun account. That helps with optimal delivery. You can only add domains you actually own. Mailgun will require you to update the domain’s DNS records so you can verify that you are authorized to send from that domain. This is not optional. It is how Mailgun confirms you are not trying to send email from a domain you do not control.
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