GlowBox lets agencies manage
outbound infrastructure cleanly,
predictably, and at scale.
Agency-grade GlowBox is pooled SMTP deliverability software built so each client’s sending stays isolated, observable, and safe as you add mailboxes.
GlowBox provides your agency with visibility,
deliverability and control.
For large companies GlowBox provides the capacity to send up to 1,000 emails per pool daily, and with several pools you can send thousands of emails per day.
We recommend our Annual Plan for agencies
Best balance of price, capacity, and scalability.
Compare plans and add-ons on the pricing page
Onboarding Playbook
Spin up a new client in hours, not weeks:
- Create a pool per client to isolate routing, limits and reporting
- Connect SMTP
- Start routing and monitoring immediately: add mailboxes as volume grows
Capacity Math (Made Simple)
Pools define:
- How many emails can be sent safely
- When to scale infrastructure
- How many mailboxes are needed
- No guesswork, no surprises
Become a GlowBox Partner
Offer deliverability as a built-in advantage
Frequently asked questions
What is GlowBox for agencies?
GlowBox is multi-client SMTP infrastructure: isolated pools per client, automated warmup and routing, and visibility so agency teams scale outbound without burning domains.
Does GlowBox replace HighLevel or a CRM?
No. Agencies keep their platforms and connect GlowBox via SMTP so deliverability is handled underneath.
Why run one pool per client?
It isolates reputation and limits so one client’s ramp or issue does not drag down another client’s placement.
How do partners and larger deployments work?
Book a partner call for volume pricing, onboarding support, and alignment with how your agency provisions sub-accounts.