When I first started using Mailgun for email marketing, I quickly realized the importance of setting up the right subdomain. A simple mistake can cause emails to fail, so I learned the hard way that it’s essential to set it up correctly from the start.
Mailgun offers two options for setting up email sending for your agency or clients: using a single subdomain or multiple subdomains. Let’s break down both options, their pros and cons, and which one might be right for you.
1. One Subdomain
With this setup, you use a single subdomain for your marketing agency’s domain. This subdomain handles email sending across all of your client accounts in Phalera.
Pros:
- Easy setup: You only need to set up one subdomain for your domain, which you already have access to.
- White-labeling: Emails are sent from your agency’s domain, looking professional.
Cons:
- Domain risk: If your domain gets a bad reputation (due to high bounce rates, for example), email will stop working for all clients.
- Solution: Avoid sending spammy emails and keep your email list clean.
2. Multiple Subdomains
With this option, you set up a unique subdomain for each client’s domain in Mailgun. This way, each client has their own sending domain.
Pros:
- White-labeling per client: Each client’s emails are sent from their own domain, keeping it personal.
- Domain protection: If one client’s domain gets disabled, it only affects their account, not others.
Cons:
- Setup is time-consuming: You’ll need to set up a subdomain for each client and gain access to each of their domains.
Conclusion
Choosing between one subdomain and multiple subdomains depends on your needs. If you’re looking for simplicity, the single subdomain approach might be best. But if you want better control and protection, setting up unique subdomains for each client is the way to go.









