Comparison
ZUI Email Suite vs Mailgun
Mailgun is the developer-first answer to 'we need to send email from the app' — the other name every SendGrid-alternatives list leads with — and its pricing is public: a Free plan at $0 with 100 emails/day, Basic at $15/month for 10,000 emails, Foundation at $35/month for 50,000 (first month free), Scale at $90/month for 100,000, and custom Enterprise, verified September 2026 on Mailgun's own pricing page. What the base price does not include: sending above your tier bills per extra email (from $1.80 per 1,000 on Basic down to $1.10 at Scale — 40,000 extra emails on Basic add $72 in a month), email address validation is metered separately (from $1.20 per 100), log retention is 1 day on Free and Basic, chat and phone support only appear at Scale, and deliverability services are a separate product line (Optimize) rather than included operations. ZUI Email Suite is the opposite shape of product: not an API you operate but sending delivered as managed infrastructure — millions of messages a month across the ZUI universe, isolated sending reputations per brand (multi-tenant), deliverability run as a product (warm pools, IP rotation, DMARC, BIMI) and GDPR-native compliance with consent receipts and shared suppression lists on EU infrastructure by default. Choose Mailgun when you have an engineering team that wants a mature, developer-first API with published self-serve pricing and stable volume. Choose Email Suite when email is infrastructure your product depends on and you would rather buy it working — multi-tenant, EU, no overage meter to watch — than run it.
Updated · Sep 14, 2026
Head-to-head
| Email Suite | Mailgun | |
|---|---|---|
| Pricing model | Managed platform pricing — a flat subscription quoted for your volume and stack, not a per-email meter. No overage table to monitor: a spike is absorbed and discussed with your operator, not billed at $1.80 per thousand. | Published self-serve ladder, verified September 2026: Free $0 (100 emails/day), Basic $15/mo for 10,000, Foundation $35/mo for 50,000 (first month free), Scale $90/mo for 100,000 — plus per-email overages above your tier (from $1.80 per 1,000 on Basic to $1.10 at Scale; 40k extra on Basic = $72 in a month). Email address validations bill separately from $1.20 per 100. |
| Who runs deliverability | ZUI runs it as a product: warm pools, IP rotation, DMARC and BIMI maintained continuously, reputation monitored per sending brand — deliverability is the service you are buying. | Real infrastructure (purpose-built MTA, analytics, webhooks) but operating it is your job — and deliverability services are sold as a separate product line (Optimize) rather than included operations; on entry tiers you share sending infrastructure with other customers. |
| Multi-tenant isolation | Built for it: isolated reputations per brand across dozens of senders and suppression lists shared across products — one product's problem never contaminates another's deliverability. | One account, one reputation: Foundation's 1,000 sending domains is a generous allowance, but domains are not isolated operations — a reputation hit lands on the account that owns the sending. |
| Compliance & data residency | GDPR-native by design: consent receipts, suppression lists shared across all ZUI products, EU infrastructure by default — residency is the default, not an option to confirm with sales. | EU data centers are available as an option, but the public pricing page documents no per-plan residency tier — where your data lives ends up being a sales conversation, not a line item. |
| Marketing + transactional | One platform for both: campaigns and transactional sending live under the same roof, the same team and the same compliance — no second subscription to reconcile at the end of the month. | Transactional-first by design: there is no native campaign builder — marketing mail means pairing Mailgun with a second tool (and a second bill), with list handling done through the API. |
| Best for | Teams that want email as working infrastructure: SaaS products, marketplaces and multi-brand operations that need EU residency and deliverability handled for them, not configured by them. | Engineering teams that want a developer-first API with solid docs, generous domain limits and published self-serve pricing — plus in-house people to watch the overage and validation meters. |
Verdict
The developer favorite earns the reputation — and its pricing is public, which we credit: Free 100/day, Basic $15 for 10k, Foundation $35 for 50k, Scale $90 for 100k, verified September 2026. But the base price is the intro, not the bill: overages charge from $1.80 per extra thousand, validations are metered from $1.20 per 100, log retention is 1 day on the low tiers, chat and phone support only appear at Scale, and deliverability services are a separate product (Optimize). ZUI Email Suite is a different purchase: not an API to operate but sending delivered as managed infrastructure — multi-tenant reputations so one brand never contaminates another, deliverability run continuously as a product, GDPR-native compliance on EU infrastructure by default, and no meters to watch. Choose Mailgun if you have engineers who want a developer-first API, stable volume and published prices. Choose Email Suite when email is infrastructure your product depends on and you want it to arrive already working.
When to choose Mailgun
Mailgun still makes sense: a developer-first API with solid documentation, generous domain allowances (1,000 sending domains on Foundation), 30-day trials on paid plans and published prices you can self-serve today. If your volume is stable, your account is healthy and you have engineers to watch the meters, there is no urgent reason to migrate — re-warming domains has a real cost.
FAQ
What operators ask before they sign.
How much does Mailgun cost?
Verified September 2026 on Mailgun's pricing page: Free at $0 (100 emails/day, 1 domain), Basic $15/month for 10,000 emails, Foundation $35/month for 50,000 (first month free), Scale $90/month for 100,000, Enterprise custom-quoted. Above your tier, overages run from $1.80 per 1,000 (Basic) to $1.10 (Scale); email validations bill separately from $1.20 per 100. Paid plans include a 30-day free trial.
What is the best EU alternative to Mailgun?
For EU data residency as a hard requirement, the honest shortlist: AWS SES pinned to EU regions (cheapest, most setup), self-hosted Postal (total control, your ops), and managed EU-native platforms like ZUI Email Suite — GDPR-native with consent receipts and EU infrastructure by default, where deliverability and compliance are operated for you. Mailgun offers EU data centers as an option, but its public pricing page documents no per-plan residency tier.
Is ZUI Email Suite cheaper than Mailgun?
It answers a different question. Mailgun's sticker is low at the entry ($15 for 10k) but the real bill adds per-email overages ($1.80 per 1,000 above Basic — 40k extra emails = $72 in a month), metered validations, and deliverability services sold separately (Optimize). Email Suite is quoted as a managed platform for your volume — the comparison that matters is total cost of operating email: warm-up, reputation, compliance documentation and meter-watching are included, not staffed by you. Stable, low-volume sending with engineers on hand: Mailgun is likely cheaper. Email as product infrastructure across brands: managed usually wins.
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