Since the request names Sendburg, it comes first; if you need to send email rather than find contacts, the alternatives below are email-sending APIs.
- 1
Sendburgsend-burg.comwebsite read, tools not yet checked
250M+ verified contacts. AI company summaries. Buying signals. 10,000 free credits per month. The ZoomInfo alternative your team actually wants to use. Sendburg 1
official:MCP server · Sendburg
- 2
SendGrid Email APIsendgrid.comverified and signed
An email API for sending text or HTML email at scale, now offered through Twilio 4.
official:API · Email Activity (beta)+12 community tools built for it
for agents: send_email · custom_api_call · Email
- 3
Resendresend.comfound in code, not yet checked
A developer email API with SDKs for sending transactional and marketing emails 2.
+12 community tools built for it
for agents: create-api-key · send-email · send-email
- 4
Mailgunmailgun.comverified and signed
A transactional email API for sending, receiving and tracking emails, with a send_email action 3.
+2 community tools built for it
for agents: send_email · custom_api_call · email
Sources
- 1Sendburg — B2B Contact Intelligence Platformsend-burg.com · read 2026-10-29
- 2Resend · Email for developersresend.com · read 2026-10-29
- 3Transactional Email API Service For Developers - Transactional Email API Service For Developers | Mailgunmailgun.com · read 2026-10-29
- 4SendGrid Email API and Email Marketing Campaigns | Twiliotwilio.com · read 2026-10-29
For agents: the 10 actions behind this answer
· Sendburg website read, tools not yet checked
250M+ verified contacts. AI company summaries. Buying signals. 10,000 free credits per month. The ZoomInfo alternative your team actually wants to use.
create-api-key · Email Sending MCP found in code, not yet checked
send_email · Mailgun (Activepieces) verified and signed
Send Email — Send an email using your Mailgun domain
send_email · SendGrid (Activepieces) verified and signed
Send Email — Send a text or HTML email
Sending · Sendmux A2A verified and signed
Send email and manage outbound attachments through Sendmux sending routes.
· SendGuard website read, tools not yet checked
The sending discipline Instantly and Smartlead give you, as one API call for n8n, SMTP, Gmail, and AI-agent senders: daily caps, warmup gating, bounce brakes, suppression, and sender-auth checks before every send.
select_organization · agentmail-mcp verified and signed
Choose which organization your AgentMail operations target (for users who
· e2a website read, tools not yet checked
Send transactional email from any product, give agents real two-way inboxes, and keep people in control. Use e2a as a hosted service or run the Apache-2.0 stack yourself.
· eusend website read, tools not yet checked
eusend is an EU-native email API for transactional email and broadcasts. Processing, storage and delivery all stay inside the EU.
· Groundmail MCP server website read, tools not yet checked
Transactional email API and SMTP for password resets, receipts and alerts. Kept separate from marketing mail, automations included, 3,000 emails/mo free.
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