Mailgun is an excellent SMTP relay and API email service for developers and GoHighLevel users. Strengths: flexible SMTP credential management, strong API, good logging, multi-domain support. Weaknesses: Flex plan price doubled to $2/1K in December 2025, no marketing campaign builder, deliverability on shared IPs is average. Best for: GoHighLevel custom SMTP, application email via API, SMTP relay for custom platforms. The December 2025 Flex plan price increase makes their fixed plans (Foundation $35/mo, Scale $90/mo) essential for cost control.
Mailgun Review 2026: Pricing, Features, and Deliverability
Current Pricing (March 2026)
| Plan | Price | Emails/Month | Dedicated IP |
|---|---|---|---|
| Flex | $2/1,000 emails | Pay as you go | $59/mo add-on |
| Foundation | $35/mo | 50,000 | $59/mo add-on |
| Scale | $90/mo | 100,000 | $59/mo add-on |
| Custom | Contact sales | 100K+ | Included |
Important: The Flex plan doubled from $1/1K to $2/1K in December 2025. At 25K emails/month, Flex costs $50 vs Foundation at $35. Switch to Foundation if you send more than 17,500 emails/month.
Strengths
SMTP credential management. Create multiple SMTP credentials per domain. Each credential can have different permissions. This is invaluable for GoHighLevel agencies managing per-client SMTP.
API quality. Clean RESTful API with excellent documentation. Sending, receiving, validating, and managing domains all via API.
Inbound email processing. Routes and stores incoming email — useful for processing replies, building inbound workflows.
Email validation. Built-in email validation (available on paid plans). Validate addresses before sending to keep your sender reputation clean.
Logging and debugging. Message logs show full delivery lifecycle: accepted, delivered, bounced, complained, opened, clicked. Essential for debugging delivery issues.
Weaknesses
Flex pricing doubled. The December 2025 price increase from $1/1K to $2/1K makes pay-as-you-go uncompetitive at any real volume.
No marketing tools. No email builder, no campaign management, no contact lists, no automation. Mailgun is infrastructure only. For marketing, you need a separate ESP.
Shared IP deliverability. Average. Not bad, but not Postmark-level. For serious deliverability, get a dedicated IP ($59/mo).
Log retention. Flex: 5 days. Scale: 30 days. Foundation: somewhere in between. Short retention windows make retroactive debugging difficult.
Who Should Use Mailgun
Good fit:
- GoHighLevel custom SMTP (the best option)
- Application developers sending via API
- SMTP relay for custom platforms
- Multi-domain management for agencies
- Developers who want flexible credential management
Bad fit:
- Marketing email campaigns (no builder, no CRM)
- Budget-sensitive low volume (Flex pricing is high)
- Pure transactional (Postmark is better)
- Non-technical users (no user-friendly interface for marketers)
For a detailed breakdown, see our SendGrid vs Mailgun and Mailgun vs AWS SES comparisons.
Practitioner note: After the Flex plan price increase, I've migrated several clients from Mailgun Flex to Foundation or Scale plans. The fixed plans include more features and are cheaper above ~18K emails/month. If you're still on Flex, check your math.
Practitioner note: For GoHighLevel agencies: Mailgun remains the gold standard for GHL SMTP. The per-domain credential management lets you isolate client sending, and the logs provide the delivery data that GHL can't show you. Just make sure you're on Foundation or Scale, not Flex.
If you need Mailgun configured optimally for your GoHighLevel agency or application, schedule a consultation.
Sources
- Mailgun: Pricing
- Mailgun: Documentation
- Mailtrap: Mailgun Deliverability Test
v1.0 · March 2026
Frequently Asked Questions
How much does Mailgun cost in 2026?
Flex (pay-as-you-go): $2/1K emails (doubled from $1/1K in December 2025). Foundation: $35/month (50K emails). Scale: $90/month (100K emails). Dedicated IP: $59/month. The Flex plan price increase makes it expensive for any meaningful volume — switch to Foundation or Scale.
Is Mailgun good for GoHighLevel?
Yes, it's the best option. Mailgun is what powers GoHighLevel's LC Email. The SMTP integration is battle-tested, credential management is flexible (per-domain credentials), and the dashboard provides delivery analytics that GHL doesn't show.
Is Mailgun better than SendGrid?
For SMTP relay and developer use: yes. Mailgun has better credential management, more detailed logging, and simpler SMTP setup. For marketing campaigns: no. Mailgun has no visual email builder. SendGrid's Marketing Campaigns feature is better for non-developers.
What happened to Mailgun's Flex plan pricing?
In December 2025, Mailgun doubled the Flex (pay-as-you-go) rate from $1/1K to $2/1K emails. This makes Flex impractical above ~17K emails/month (where Foundation at $35/mo becomes cheaper). If you're on Flex, evaluate switching to a fixed plan.
Does Mailgun have good deliverability?
On dedicated IPs: good, comparable to competitors. On shared IPs: average. Independent tests show Mailgun shared IP inbox placement around 71% (better than SendGrid's 61% in the same test). Results vary by pool.
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