Pick SendGrid if your team needs built-in marketing automation alongside transactional email, or if you want a single platform that handles both API sends and campaign management. Pick Mailgun if you want a leaner developer-focused API, EU data residency without a plan upgrade, or built-in email validation without buying an add-on. Neither is universally better. The decision turns on volume, your stack’s geography, and whether you need automation tools in the same product.
This comparison covers the dimensions that actually change the decision: pricing structure, deliverability, API and SDK quality, analytics and log retention, EU compliance, support, and automation depth. Verified against official pricing pages and documentation as of June 2026.
How They Position Themselves
Twilio SendGrid is a full-stack email platform. The Email API handles transactional sends; Marketing Campaigns handles list management, segmentation, and broadcast emails. These are two separate products with separate billing, which matters when you’re budgeting.
Mailgun (owned by Sinch since 2021) stays squarely focused on API-driven transactional and programmatic email. It does not offer a comparable marketing campaigns suite. What it offers is inbound routing, email validation, and a regional EU infrastructure, all built into the core product.
The distinction shapes every other comparison below.
Pricing Structure
SendGrid
SendGrid’s Email API uses four tiers. After the 60-day free trial (100 emails/day), you move to a paid plan:
| Plan | Monthly Price | Email Volume |
|---|---|---|
| Essentials | $19.95/mo | Up to 100,000 emails |
| Pro | $89.95/mo | Up to 2.5 million emails |
| Premier | Custom | Above 2.5 million |
Dedicated IPs are included with Pro; Essentials puts you on shared infrastructure. Marketing Campaigns automation is a separate product starting at $60/month for the Advanced plan, billed by contact count, not volume.
SendGrid raised Essentials from $14.95 to $19.95 in early 2024 and eliminated the permanent free tier in 2025, replacing it with a 60-day trial.
Mailgun
Mailgun’s plans are tiered by volume:
| Plan | Monthly Price | Email Volume | Log Retention | Dedicated IPs |
|---|---|---|---|---|
| Free | $0 | 100 emails/day | 1 day | No |
| Basic | $15/mo | 10,000 emails | 1 day | No |
| Foundation | $35/mo | 50,000 emails | 5 days | No |
| Scale | $90/mo | 100,000 emails | 30 days | Yes |
A free tier with no expiry is available (100 emails/day), which gives you indefinite low-volume access for development and testing. Mailgun eliminated its Flex (pay-as-you-go) plan for new users in December 2025, when prices doubled from $1.00 to $2.00 per 1,000 messages; existing Flex users were grandfathered but new accounts must use the tiered plans.
Overage on Mailgun runs $1.30 per 1,000 additional emails on the Foundation plan and $1.10 on Scale.
Pricing Verdict
At low volume (under 10,000 emails/month), Mailgun’s Basic plan at $15/month undercuts SendGrid Essentials at $19.95. At mid-volume (50,000/month), Mailgun Foundation at $35 versus SendGrid Essentials at $19.95 flips the comparison, though Essentials lacks dedicated IPs. At scale (100,000+ emails), Mailgun Scale at $90 and SendGrid Pro at $89.95 land at near parity on transactional-only cost. Add a marketing automation requirement and SendGrid’s total cost rises significantly once you layer in Marketing Campaigns.
Deliverability and Reputation Tooling
Both platforms can achieve strong deliverability when authentication (SPF, DKIM, DMARC) is configured correctly and list hygiene is maintained. Vendor-level infrastructure differences are smaller than most marketing comparisons claim.
Where they differ:
Dedicated IPs. SendGrid requires the Pro plan ($89.95/month minimum) to access dedicated IPs. Mailgun makes dedicated IPs available on the Scale plan ($90/month). The cost threshold is similar, but SendGrid’s documentation recommends dedicated IPs only for senders exceeding 50,000 emails per month. Both require IP warmup, which you manage yourself.
Email validation. Mailgun’s Scale plan includes 5,000 email validations per month as part of the plan. SendGrid offers email validation, but it is priced as a separate add-on. For teams with high list churn or user-generated sign-ups, built-in validation is a meaningful operational difference.
Shared infrastructure risk. On Essentials (SendGrid) or Basic/Foundation (Mailgun), you share IP pools with other senders. How those pools are managed and segregated is not fully transparent on either platform. Independent tests published by Mailtrap in early 2025 measured 61% inbox placement on SendGrid shared IPs; Mailgun claims a 97.4% average delivery rate across its infrastructure, though that figure is from Mailgun’s own marketing pages. Treat both claims as directional, not definitive.
API and SDK Quality
Both platforms offer REST APIs and SMTP relay. The difference is in surface area and developer ergonomics.
SendGrid provides official SDKs for Python, Node.js, Ruby, PHP, Java, C#, Go, and Perl. The API covers transactional sends, template management, suppression lists, bounces, and stats. The JavaScript SDK has been criticized in 2025 reviews for pre-TypeScript patterns and loose typing compared to newer alternatives. Documentation is thorough and has benefited from Twilio’s investment, with clear references and a large community.
Mailgun provides official SDKs for Python, Node.js, Ruby, PHP, Java, C#, and Go. The API surface includes transactional sends, inbound routing (catch-all or regex-based route matching to forward or store messages), email validation, and template management. Inbound routing is a notable capability: you can receive email at a domain and forward it to an HTTP endpoint, making Mailgun viable as both an outbound and inbound processing layer. This is not available in SendGrid’s Email API.
Authentication setup is procedurally similar on both platforms (DNS records for DKIM and SPF, optional DMARC policy). Mailgun walks you through domain setup per region (US or EU); SendGrid’s domain authentication wizard is well-documented within the Twilio docs.
Analytics and Log Retention
Log retention is a meaningful operational consideration, not just a minor plan detail. When debugging a deliverability issue days after it happened, access to detailed event logs matters.
| Plan Level | SendGrid | Mailgun |
|---|---|---|
| Entry plan | 7 days (Essentials) | 1 day (Basic) |
| Mid-tier | 7 days (Pro, with add-on for 30d) | 5 days (Foundation) |
| Scale/Pro | 30 days (add-on, bundled with Pro) | 30 days (Scale, included) |
SendGrid added Email Logs (separate from Activity Feed) in November 2025, extending message-level visibility to 30 days for Pro. For Essentials users, extending beyond 7 days requires purchasing the 30-Day Activity History add-on separately. Mailgun’s 30-day retention is included in the Scale plan at $90/month with no add-on required.
Both platforms expose delivery, bounce, open, click, and spam-complaint events via webhooks. Real-time event forwarding is available on all paid tiers.
EU Data Residency
This is a genuine differentiator for teams subject to GDPR data residency requirements.
Mailgun offers EU sending infrastructure as a first-class feature, available to all plan tiers. You configure a domain against the EU API endpoint (api.eu.mailgun.net), and all processing, storage of message data, and event logs occur within Mailgun’s EU data center (Germany). EU and US domains can coexist in a single account. According to Mailgun’s documentation, this option is available without a plan-tier restriction.
SendGrid added EU Data Residency as a feature, but it is gated behind Pro and Premier plans. Eligible Pro customers can configure EU subusers that route PII and event data to EU-based infrastructure. Essentials users cannot access EU data residency.
If EU data processing compliance is a hard requirement and you’re not yet at Pro volume, Mailgun has a concrete advantage.
Marketing Automation and Lifecycle Features
This is one of the starkest differences.
SendGrid’s Marketing Campaigns product includes audience segmentation, automated series triggered by contact properties, A/B testing, and a drag-and-drop visual editor. It is a legitimate marketing automation tool, not just a broadcast sender. The limitation is that it is an entirely separate product with a separate interface and separate billing that starts at $60/month for automation features.
Mailgun has no comparable marketing campaigns product. If you need automation (onboarding sequences, behavioral triggers, lifecycle flows), you’ll integrate a separate tool or use a platform that combines both functions. Mailgun is a send infrastructure layer; the automation logic lives in your application or a connected system.
For teams that want API-driven transactional email only, this distinction is irrelevant. For teams that want a unified platform for transactional and lifecycle sends, Mailgun requires a second tool. SendGrid provides it, albeit fragmented across two billing lines.
Support
SendGrid’s live support is gated behind Pro and Premier plans. Essentials accounts rely on self-service documentation, community forums, and a ticketing system. Twilio’s documentation is extensive and the developer community is large enough that most issues have a searchable answer.
Mailgun includes live chat support starting at the Scale plan ($90/month). Foundation and below are limited to ticket-based support. Mailgun’s help center is less exhaustive than SendGrid’s, reflecting the smaller surface area of the product.
Neither platform offers strong support at entry-level pricing. If support SLAs matter, both require a higher-tier plan.
Head-to-Head Summary
| Dimension | SendGrid | Mailgun |
|---|---|---|
| Free tier | 60-day trial only (100 emails/day) | Permanent (100 emails/day) |
| Entry price | $19.95/mo (100K emails) | $15/mo (10K emails) |
| Dedicated IPs | Pro plan ($89.95/mo) | Scale plan ($90/mo) |
| EU data residency | Pro/Premier only | All tiers |
| Log retention (entry) | 7 days | 1 day |
| Log retention (scale) | 30 days (included in Pro) | 30 days (included in Scale) |
| Email validation | Paid add-on | 5,000/mo on Scale |
| Inbound email routing | Not in Email API | Available (all paid tiers) |
| Marketing automation | Yes (separate product, from $60/mo) | No |
| Official SDKs | 8 languages | 7 languages |
| Live chat support | Pro+ | Scale only |
Use-Case Recommendations
Choose SendGrid if:
- You need marketing automation (campaign management, segmentation, behavioral triggers) alongside transactional sending and are willing to pay for two separate products.
- You are already in the Twilio ecosystem and want consolidated billing and support.
- Your volume puts you solidly on the Pro plan, where the feature gap narrows.
Choose Mailgun if:
- You need EU data residency without a Pro-tier commitment.
- Your stack requires inbound email routing alongside outbound sends.
- You want email validation included without an add-on purchase.
- You’re at early-stage volume (under 10,000 emails/month) and want a lower entry price with a permanent free tier for development.
Neither may be the right fit if:
- You want lifecycle automation and transactional email in one tightly integrated platform. SendGrid’s two-product structure adds friction; Mailgun doesn’t offer it at all. In that case, compare transactional email services that offer both capabilities natively.
Other Options to Consider
If neither SendGrid nor Mailgun maps cleanly to your requirements, the SendGrid alternatives and Mailgun alternatives posts cover the broader landscape, including Postmark (highest transactional deliverability reputation), Amazon SES (lowest cost at scale on AWS), Resend (modern TypeScript-first DX), and options with full lifecycle automation built in.
Is SendGrid or Mailgun cheaper?
At low volume (under 10,000 emails/month), Mailgun Basic at $15/month is cheaper than SendGrid Essentials at $19.95/month. At 50,000 emails/month, SendGrid Essentials ($19.95) is cheaper than Mailgun Foundation ($35). At 100,000 emails/month, both land near $90/month for transactional-only sending. If you add marketing automation, SendGrid’s total cost rises substantially because Marketing Campaigns is billed separately starting at $60/month.
Which has better deliverability: SendGrid or Mailgun?
Both platforms deliver strong results when your domain authentication (SPF, DKIM, DMARC) is properly configured and your list hygiene is maintained. Neither platform has a systematic deliverability advantage at the infrastructure level that overrides sender behavior. The main practical difference is that Mailgun includes email validation on the Scale plan, which helps reduce invalid addresses before they damage your sending reputation.
Is Mailgun better for developers?
Mailgun is narrower in scope, which can make it feel more focused. It supports inbound email routing and regional EU infrastructure natively, which are useful capabilities for developers building more complex email flows. SendGrid has more extensive documentation and a larger community, which tends to matter more for developers who hit edge cases. Both have comparable SDK coverage across major languages.
Can I use SendGrid for EU data residency?
Yes, but it requires a Pro or Premier plan. EU data residency on SendGrid routes message PII and event data to EU-based infrastructure via an EU subuser configuration. Essentials accounts do not have access to this feature. Mailgun makes EU infrastructure available on all paid tiers, including Basic at $15/month.
Does Mailgun have marketing automation?
No. Mailgun is a transactional and programmatic email API. It does not include marketing campaigns, behavioral automation, or a visual email builder. If you need lifecycle automation (onboarding sequences, drip campaigns, behavioral triggers), you’ll need to either build the logic in your application or integrate a separate tool.
Can I switch from SendGrid to Mailgun (or vice versa)?
Yes. Both platforms support standard SMTP relay as a migration path alongside their REST APIs. The main migration work is re-authenticating your sending domain on the new provider’s DNS records (DKIM, SPF), moving any stored templates to the new system, updating your API client code to the new SDK, and rerouting webhook endpoints. Neither platform locks you into a proprietary data format that prevents switching.
I’ve spent my career building software at scale with a soft spot for email: deliverability, lifecycle campaigns, and getting messages to actually land. I started Coldletter to fix what bugged me about transactional and marketing email tools. I’m based in Vancouver.