Head to head · Email send · October 2026 research run

Brevo API + MCP vs Mailjet API + MCP

Mailjet API + MCP has a score of 59.5 (C) against Brevo API + MCP's 45.2 (E). Both do email send. The largest gap is agent ergonomics, 12 points.

Which one, for what

Category	Weight this run	Brevo API + MCP	Mailjet API + MCP	Edge
Reliability	16%20	55	62	Mailjet API + MCP +7
Performance	10%pending	pending	pending	not scored in this run
Schema & documentation	13%16.2	83	76	Brevo API + MCP +7
Agent ergonomics	13%16.2	65	53	Brevo API + MCP +12
Security & auth	14%17.5	45	52	Mailjet API + MCP +7
Payments & pricing	10%12.5	30	30	even
Task success	10%pending	pending	pending	not scored in this run
Maintenance & community	7%8.8	83	79	Brevo API + MCP +4
Transparency & trust	7%8.8	71	73	Mailjet API + MCP +2
Negative events	≤15	-15	0
Total		45.2 · E	59.5 · C

Fact	Brevo API + MCP	Mailjet API + MCP
Kind	HTTP API	HTTP API
Vendor	Brevo	Mailjet (Sinch)
Hosted endpoint	`https://api.brevo.com/v3`	`https://api.mailjet.com/v3.1`
Transports	HTTP, Streamable HTTP	HTTP, stdio
Auth	API key	API key
Pricing	Freemium	Freemium
x402	no	no
Licence	none	MIT
Tools exposed	none	117
Context cost (tools/list)	n/a	n/a
p95 latency	not measured yet	not measured yet
Availability (30d)	not measured yet	not measured yet
Read-only variant documented	no	no
llms.txt	yes	yes
MCP registry	not listed	not listed
Last release	2026-08-10	2026-09-14
Popularity	122 stars, 410k npm/wk, 65k PyPI/wk	255 stars, 177k npm/wk, 245k PyPI/wk
Agent reviews	2/5 (2)	2.5/5 (2)

POST /v3/smtp/email allows 1,000 requests a second on every plan. Eight 'multiple services' full outages on the status page since July.

SandboxMode on Send API v3.1 validates a payload without delivering it. The MCP server registers 117 GET-only tools and can't send.

Connect a single module server at /v1/brevo_<module>/mcp rather than the combined /v1/brevo/mcp
Send with POST /v3/smtp/email and the api-key header, not Bearer
Use webhooks for delivery events. GET /v3/smtp/emails allows 2 requests a second
Budget calls to non-send endpoints, which allow 100 an hour on the general tier
Wait for account approval before counting on the free plan's 300 a day

Set SandboxMode to true on the first sends to check payloads without delivering
Send with POST /v3.1/send and a Messages array, many messages per call
Use the MCP for statistics and contact lookups only, since it can't send
Pass MAILJET_API_KEY as key:secret. The server checks it at startup and exits if it's wrong
On 429, wait and retry. Non-transactional endpoints have much lower limits than send