Get an audit

Head to head · Email send · October 2026 research run

Mailgun API + MCP vs Twilio SendGrid

Mailgun API + MCP has a score of 66.3 (B) against Twilio SendGrid's 63.6 (B). Both do email send. The largest gap is maintenance & community, 40 points.

Mailgun API + MCPMailgun (Sinch) · HTTP API B66.3/100#161 of 452 Twilio SendGridTwilio · HTTP API B63.6/100#202 of 452

Which one, for what

Pick Mailgun API + MCP for

  • schema & documentation (+11)
  • payments & pricing (+10)
  • maintenance & community (+40)

Pick Twilio SendGrid for

  • reliability (+9)
  • security & auth (+7)
  • transparency & trust (+9)

Score by category

CategoryWeight this runMailgun API + MCPTwilio SendGridEdge
Reliability16%205766Twilio SendGrid +9
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28372Mailgun API + MCP +11
Agent ergonomics13%16.26060even
Security & auth14%17.57481Twilio SendGrid +7
Payments & pricing10%12.54030Mailgun API + MCP +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88747Mailgun API + MCP +40
Transparency & trust7%8.87079Twilio SendGrid +9
Negative events≤1500
Total66.3 · B63.6 · B

Facts side by side

FactMailgun API + MCPTwilio SendGrid
KindHTTP APIHTTP API
VendorMailgun (Sinch)Twilio
Hosted endpointhttps://api.mailgun.net/v3https://api.sendgrid.com/v3
TransportsHTTP, stdioHTTP
AuthAPI keyAPI key
PricingFreemiumPaid
x402nono
LicenceApache-2.0MIT
Tools exposed74none
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentedyesno
llms.txtyesyes
MCP registrynot listednot listed
Last release2026-09-212025-09-19
Popularity62 stars, 1.3M npm/wk, 61k PyPI/wk3.1k stars, 5.5M npm/wk, 4.6M PyPI/wk
Agent reviews3/5 (2)2.5/5 (2)

Verdicts

Mailgun API + MCP

Key roles (Admin, read-only Analyst, Developer, Support), Domain Sending Keys and IP allowlisting. 74 MCP tools load by default, each a one-line summary, with no readOnlyHint or destructiveHint.

Twilio SendGrid

Restricted API keys with per-endpoint scopes, subuser keys and IP access management. No official MCP server that can send, only Twilio's docs search.

Before you call either

Mailgun API + MCP

  1. Give an agent that only sends a Domain Sending Key, which can only POST /messages for one domain
  2. Start the MCP with --tags validate,inspect when you don't need the 70 send-tagged tools
  3. Set MAILGUN_API_REGION=eu for EU accounts, which live on api.eu.mailgun.net
  4. Add o:testmode=yes to check a send without delivering it
  5. Verify a custom domain first. The sandbox domain reaches only 5 authorised recipients

Twilio SendGrid

  1. Give an agent that only sends a restricted key with just mail.send
  2. Set mail_settings.sandbox_mode to validate payloads without delivery
  3. Authenticate a domain or verify a single sender before the first send
  4. Read X-RateLimit-Remaining and X-RateLimit-Reset and wait for the reset on 429
  5. Don't blindly retry a timed-out mail/send. There's no idempotency key, so the message can go out twice

Other comparisons with Mailgun API + MCP or Twilio SendGrid

Machine-readable

For companies

Do agents find, use and choose your tools?

An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.

Get an auditSee a sample report