AI visibility report
Mailgun ranks #2 in Transactional Email & Developer Email APIs AI search.
Outside the top three on 11 of the 25 prompts buyers actually ask.
Mailtrap is cited on 7 of those losses.
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Also benchmarked
Mailgun appears in another vertical
Track Mailgun across these prompts daily.
Start free trial#2 among 9 vendors · still absent from 75.3% of tracked prompt responses
Top-3 citations across 150 prompt × platform pairs
Peer Ranking
Key Metrics
Platform Breakdown
Google AI Mode
ChatGPT
Perplexity
Gemini Search
Bing Copilot
GrokVisible, but narrative can improve. Mailgun ranks #2 on presence but #5 on sentiment. The brand appears relatively often, but competitors may be getting more favorable language when they appear.
Where Mailgun is losing
Prompts where competitors are visible and Mailgun is not.
These prompt-level losses are the first prompts to track and repair.
Where Mailgun is winning5
I need a transactional email platform that supports both email and SMS notifications through a single API — which services offer this?
Avg # 3.0 · 2 platforms
Which transactional email platforms support sending bulk notification emails at scale while maintaining high deliverability rates?
Avg # 3.0 · 1 platform
What's the easiest transactional email API to integrate into a new web app that needs password reset and verification emails working in under an hour?
Avg # 3.3 · 3 platforms
Looking for a transactional email platform with a preview tool so developers can see exactly how an email renders across clients before deploying changes?
Avg # 3.5 · 4 platforms
Which email delivery services support multi-tenant setups so a SaaS platform can send emails on behalf of its customers with per-tenant domain authentication?
Avg # 4.0 · 2 platforms
Where Mailgun is losing5
Which email API services have a local development sandbox so engineers can test emails without sending to real inboxes during development?
Competitors on 3 platforms
Track this promptWhich transactional email platforms have the best uptime and redundancy to ensure time-sensitive emails like OTPs are delivered within seconds?
Competitors on 2 platforms
Track this promptWhat email API services can reliably send 1 million transactional emails per hour without queue delays for a high-volume SaaS product?
Competitors on 2 platforms
Track this promptWhich transactional email services let developers define email templates in code as React or HTML components rather than in a dashboard?
Competitors on 2 platforms
Track this promptI'm looking for a transactional email service that handles domain authentication setup with clear documentation — which ones make DNS configuration easy?
Competitors on 2 platforms
Track this prompt
Track Mailgun daily before the next report refresh.
Track these gapsResearch dossierCapabilities, use cases, sources, reviews, pricing, and FAQ
Overview
Mailgun, a Sinch brand, is a developer-focused transactional email API and SMTP relay platform founded in 2010 by Ev Kontsevoy and Taylor Wakefield. Incubated through Y Combinator in 2011 and later acquired by Rackspace, it spun out independently in 2017 before joining Sinch's CPaaS portfolio via the $1.925 billion Pathwire acquisition in 2021. The platform serves over 150,000 businesses—including Microsoft, Lyft, Wikipedia, and American Express—processing more than 600 billion emails annually. Core products include Send (API and SMTP relay), Optimize (deliverability suite), Validate (email address verification), and Inspect (email preview powered by Email on Acid). Mailgun supports multi-region data residency across the US and EU and holds ISO, CSA, and GDPR certifications. It targets engineering teams and developers requiring scalable, programmatic email infrastructure with deep analytics, webhooks, and suppression management.
Mailgun is a transactional email delivery platform and API service built for developers, offering programmatic email sending via RESTful API and SMTP relay, real-time email validation, inbound routing, deliverability optimization, and pre-send email testing. It is a subsidiary of Sinch AB and part of the Sinch Email portfolio alongside Mailjet and Email on Acid.
Key Facts
- Founded
- 2010
- HQ
- San Antonio, TX, USA (parent Sinch HQ: Stockholm, Sweden)
- Founders
- Ev Kontsevoy, Taylor Wakefield
- Funding
- ~$50M (pre-acquisition standalone rounds
- Customers
- 150,000+
- Status
- Subsidiary of Sinch AB (Nasdaq Stockholm: SINCH)
Target users
Key Capabilities10
- RESTful Email API and SMTP relay for programmatic transactional sending
- Real-time email validation API and bulk list validation
- Inbound email routing and parsing with webhook forwarding
- Dedicated IP pools with automated warm-up
- Advanced suppression management (bounces, unsubscribes, complaints)
- Deliverability suite (Optimize): inbox placement testing, reputation monitoring, blocklist alerts
- Email preview and accessibility testing (Inspect, powered by Email on Acid)
- Send time optimization (STO) using machine learning
- Real-time event webhooks, searchable logs, and delivery analytics
- Multi-region data residency (US and EU) with GDPR, ISO, and CSA compliance
Key Use Cases8
- Transactional email delivery (order confirmations, password resets, account notifications)
- Two-factor authentication and identity verification emails
- High-volume application-triggered email at scale (millions/day)
- Email list hygiene and real-time address validation at signup
- Inbound email routing and webhook processing for support or app workflows
- Email deliverability monitoring and inbox placement optimization
- Pre-send email preview and accessibility compliance testing
- Martech and SaaS platform partnerships requiring embedded email infrastructure
Recent Trend
How AI describes Mailgun3
Mailgun : Mailgun offers a dedicated inbound parsing tool that handles high-volume emails, making it suitable for automating customer support replies and converting unstructured email data into structured, actionable JSON.
Looking for a transactional email platform with a preview tool so developers can see exactly how an email renders across clients before deploying changes?
Mailgun : A strong choice for developers needing comprehensive email validation alongside sending, with robust Node.js support.
I need a transactional email platform that supports both email and SMS notifications through a single API — which services offer this?
Mailgun : Offers robust automation for suppression management, automatically adding hard bounces and spam complaints to a suppression list.
Which transactional email services let developers define email templates in code as React or HTML components rather than in a dashboard?
Most cited sources8
12Email Preview Tool & Marketing Templates - Transactional Email API Service For Developers | Mailgun
mailgun.com·Product Page
- 10
Transactional Email API Service For Developers - Transactional Email API Service For Developers | Mailgun
mailgun.com·Comparison
- 8
Transactional Email API Service - Transactional Email API Service For Developers | Mailgun
mailgun.com·Comparison
- 6
Top 5 Email Platforms With Free Tiers for Developers and Teams - Transactional Email API Service For Developers | Mailgun
mailgun.com·Comparison
- 6
Infrastructure - Transactional Email API Service For Developers | Mailgun
mailgun.com·Comparison
- 6
Automatic service to warm up dedicated IPs - Transactional Email API Service For Developers | Mailgun
mailgun.com·Comparison
Alternatives in Transactional Email & Developer Email APIs6
Mailgun positions itself as the leading developer-first transactional email API and SMTP relay platform, emphasizing deliverability, cloud-scale reliability, and a rich RESTful API built 'by developers, for developers.' It differentiates from marketing-oriented rivals (e.g., Mailchimp) by focusing on programmatic email workflows, advanced suppression management, real-time event webhooks, and a companion deliverability suite (Optimize).
- Within the Sinch portfolio, Mailgun targets high-volume technical senders while sister brand Mailjet serves marketer-led workflows.
- Its key competitive advantages include multi-region data residency (US and EU), 150,000+ business customer base, and integration with Sinch's broader CPaaS ecosystem (SMS, voice, video).
- It competes most directly with Twilio SendGrid on developer mindshare and AWS SES on price-sensitive, high-volume workloads.
Reviews
Praised
- Clean, well-documented RESTful API
- Easy SDK integration across multiple languages
- Reliable transactional email delivery and uptime
- Real-time event logs and searchable delivery history
- Granular deliverability analytics and bounce classification
- Straightforward domain and DNS setup
- Generous free tier for testing and low-volume use
- Responsive technical support on paid plans
Criticized
- Pricing escalation and unpredictable overage costs
- Account suspensions without prior notice or clear explanation
- Slow or unhelpful support during account suspension events
- Dedicated IPs and Optimize deliverability suite are expensive add-ons
- Limited built-in visual email template/campaign builder
- UI feels dated and less accessible to non-developer users
- Steep learning curve for advanced routing and suppression features
- No multi-subaccount billing with separate payment methods
Mailgun earns strong marks on G2 (4.2/5, 322 reviews) and Capterra (4.3/5, ~182 reviews), with recurring praise for its clean RESTful API, comprehensive SDKs, reliable transactional delivery, real-time event logs, and detailed deliverability analytics. Developers consistently rate it as easy to integrate and well-documented. Critical themes cluster around pricing—cited as the top complaint on G2 with 11 mentions—account suspension without warning (a notable pain point for SaaS operators), limited visual campaign tooling for non-technical users, and a UI that some find dated. Reviewers note the platform is best suited for API-comfortable teams managing custom transactional workflows, while those seeking low-code marketing campaign builders may find it restrictive.
Pricing
Mailgun uses a four-tier volume-based Send plan structure billed monthly: Free (100 emails/day, $0), Basic (from $15/mo for 10K emails), Foundation (from $35/mo for 50K emails, 1-month free trial), and Scale (from $90/mo for 100K emails, 1-month free trial). Enterprise plans are custom-priced for 2.5M+ sends/month and include Rapid Fire Burst SLA and managed deliverability consulting. Overage rates range from $1.80/1K (Basic) down to $1.10/1K (Scale). Dedicated IPs are add-ons at $59/IP/month. The Optimize deliverability suite is priced separately starting at $49/mo (Pilot) and $99/mo (Starter). Email validation on Foundation is priced from $1.20 per 100 validations. The legacy Flex pay-as-you-go plan was discontinued for new users and its pricing doubled to $2.00/1K in December 2025.
Limitations
- Reviewers frequently cite pricing escalation post-Sinch acquisition, including a 100% price increase on the legacy Flex plan (from $1.00 to $2.00/1K emails) effective December 2025 and reports of 20–40% general price increases since 2021.
- Dedicated IPs cost $59/month each and are not included on entry-level plans.
- The Optimize deliverability suite is a separate subscription (starting at $49/mo), not bundled with Send plans.
- Account suspensions without prior notice are a recurring complaint, with some users reporting mission-critical email outages lasting multiple days.
- The platform lacks a robust visual campaign builder, making it less suitable for non-technical marketers.
- Third-party inbox placement tracking (GlockApps) reportedly showed a significant decline in Mailgun's inbox placement rate between Q1 2024 and Q1 2025.
- Multi-subaccount billing with separate payment methods is not supported.
Frequently asked questions
Topic coverageCoverage by buyer topic
Topic Coverage
Prompt-Level Results
| Prompt | ChatGPT | Bing Copilot | Perplexity | Gemini Search | Google AI Mode | Grok |
|---|---|---|---|---|---|---|
Capability5/5 cited (100%) | ||||||
What email API services support inbound email parsing so applications can receive and process replies programmatically? | ||||||
I need a transactional email platform that supports both email and SMS notifications through a single API — which services offer this? | ||||||
Which transactional email tools support suppression lists and bounce handling automatically so teams don't have to manage unsubscribes manually? | ||||||
Which transactional email platforms support sending bulk notification emails at scale while maintaining high deliverability rates? | ||||||
What email delivery services provide per-email open and click tracking with webhook events for downstream processing in a data pipeline? | ||||||
Developer Experience3/5 cited (60%) | ||||||
Looking for a transactional email platform with a preview tool so developers can see exactly how an email renders across clients before deploying changes? | ||||||
What transactional email tools do developer-first startups prefer for their clean API design and minimal boilerplate when sending templated messages? | ||||||
Which email delivery services offer a type-safe API client with autocomplete so engineers catch mistakes before runtime? | ||||||
Which transactional email services let developers define email templates in code as React or HTML components rather than in a dashboard? | ||||||
What email API platforms have the best developer documentation and quickstart guides so engineers don't have to guess how the API works? | ||||||
Integrations & Ecosystem4/5 cited (80%) | ||||||
What email API services have webhooks that integrate with a data warehouse so delivery events are automatically logged for analytics? | ||||||
What transactional email platforms have strong support for DMARC, DKIM, and SPF management to help teams pass enterprise security reviews? | ||||||
Looking for a transactional email provider that works seamlessly with a headless CMS for templating content-driven notification emails — what are my options? | ||||||
Which email delivery services support multi-tenant setups so a SaaS platform can send emails on behalf of its customers with per-tenant domain authentication? | ||||||
Which transactional email platforms integrate natively with popular backend frameworks so email sending is a one-line function call? | ||||||
Performance & Reliability4/5 cited (80%) | ||||||
What email delivery services offer dedicated IPs and warmup tools to maintain sender reputation for high-volume senders? | ||||||
Which transactional email providers have the best deliverability rates for reaching business inboxes without landing in spam? | ||||||
Which transactional email platforms have the best uptime and redundancy to ensure time-sensitive emails like OTPs are delivered within seconds? | ||||||
What email API services can reliably send 1 million transactional emails per hour without queue delays for a high-volume SaaS product? | ||||||
Which transactional email providers have the lowest p99 delivery latency for critical user-facing emails like account confirmations? | ||||||
Setup & First Run4/5 cited (80%) | ||||||
Which email API services have a local development sandbox so engineers can test emails without sending to real inboxes during development? | ||||||
What's the easiest transactional email API to integrate into a new web app that needs password reset and verification emails working in under an hour? | ||||||
I'm looking for a transactional email service that handles domain authentication setup with clear documentation — which ones make DNS configuration easy? | ||||||
What transactional email platforms have the best free tier for a startup sending fewer than 5k emails per month while getting started? | ||||||
Which developer email platforms have the best SDKs so a backend engineer can add transactional email support to a Node.js app in minutes? | ||||||
Turn this matrix into daily prompt monitoring.
Track prompt changesVertical Ranking
| # | Brand | PresencePres. | Share of VoiceSoV | DocsDocs | BlogBlog | MentionsMent. | Avg PosPos | Sentiment |
|---|---|---|---|---|---|---|---|---|
| 1 | Mailtrap | 26.7% | 35.6% | 1.3% | 21.3% | 10.7% | #6.8 | +0.46 |
| 2 | Mailgun | 24.7% | 35.6% | 2.0% | 10.0% | 10.0% | #8.4 | +0.39 |
| 3 | Amazon SES | 7.3% | 6.9% | 0.0% | 0.0% | 1.3% | #10.2 | +0.34 |
| 4 | Resend | 6.7% | 8.0% | 0.7% | 0.0% | 6.7% | #7.0 | +0.66 |
| 5 | SendGrid | 5.3% | 6.4% | 3.3% | 0.7% | 4.0% | #6.5 | +0.47 |
| 6 | Mailjet | 4.7% | 5.9% | 0.0% | 1.3% | 0.0% | #4.8 | +0.44 |
| 7 | SparkPost | 0.7% | 1.6% | 0.7% | 0.0% | 0.7% | #6.3 | +0.00 |
| 8 | Loops | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | — | — |
| 9 | Plunk | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | — | — |
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