Mailtrap Email API/SMTP by Mailtrap (Railsware)

Transactional and bulk email sending via API or SMTP, with a separate email testing sandbox.

Email sending Official MCP server

Price

$1 / 1k requests

free tier, plans from $15/mo

Free tier

Yes

4,000 emails per month (150 emails/day)

SDK downloads

—

npm mailtrap · PyPI mailtrap

Status

—

Pricing

Free tier	4,000 emails per month (150 emails/day)
Cheapest paid plan	$15 a month
Usage price	Basic: $15/month for 10,000 emails; extra emails $1 per 1,000 (Basic)
Good to know	per_1k_usd is the Basic-plan overage rate for extra emails. Email Sandbox (testing) has its own free plan of 50 test emails/month.

From the official pricing page, checked Oct 10, 2026. Prices change: confirm before you buy.

API	Free	Price	SDK downloads / wk	GitHub stars	MCP
MailerSend Email API and SMTP relay service for sending, tracking, and managing transactional and marketing emails.	500 emails/month	$0.9 / 1k requests · free tier	—	—
SparkPost Send and track transactional and marketing emails at scale.	1,000 emails/month, 50/day cap	$0.9 / 1k requests · free tier	—	—
Courier Multichannel notifications and customer messaging platform for sending across email, SMS, and chat.	10,000 sends per month	$5 / 1k requests · free tier	—	—
Resend Developer email API for sending and receiving transactional and marketing email.	3,000 emails/month, 100/day, 3 domains	Free plan · paid from $20/mo	16.2M	964	MCP
Twilio SendGrid High-volume email API and SMTP relay with deliverability tooling and marketing campaigns.	Free trial: 100 emails/day for 60 days	Free plan · paid from $19.95/mo	9.7M	3,052	MCP (community)
Postmark Transactional email API and SMTP service focused on fast delivery, with inbound processing.	100 emails/month (Developer plan, never expires)	Free plan · paid from $15/mo	1.2M	361	MCP