The request "resend" is ambiguous: it most likely means sending or re-sending email via an API. Resend (resend.com) is an email-sending API for developers with a send endpoint and batch sending 313, and Twilio SendGrid offers an email API with its Email and Mail actions 111. Mailgun and Mailtrap provide comparable transactional send APIs 2126.
A question back: Do you mean re-sending a failed or previously sent email, or sending email from code? If you meant re-sending a specific message, which email provider are you using?
- 1
Resendresend.comverified and signed
Developer email platform whose POST /emails action sends an email and whose batch action sends up to 100 emails in one API call 13.
+12 community tools built for it
for agents: send_batch_emails · POST /emails · POST /emails
- 2
Twilio SendGrid Email APItwilio.comverified and signed
Email API for sending transactional and marketing email, with an Email action and a Mail action for sending messages 111.
official:API · Email Activity (beta)+13 community tools built for it
for agents: Email · Mail · create-api-keys
- 3
Mailgun Transactional Email APImailgun.comverified and signed
Transactional email API whose send_email action sends an email using a Mailgun domain 12.
+2 community tools built for it
for agents: send_email · custom_api_call · email
- 4
Mailtrapmailtrap.iofound in code, not yet checked
Email platform whose send-email action sends an email via the Mailtrap Email API, with batch and sandbox sending options 6.
+1 community tools built for it
for agents: send-email · batch-send-transactional-email · send-sandbox-email
Sources
- 1SendGrid Email API and Email Marketing Campaigns | Twiliotwilio.com · read 2026-10-29
- 2Transactional Email API Service For Developers - Transactional Email API Service For Developers | Mailgunmailgun.com · read 2026-10-29
- 3Resend · Email for developersresend.com · read 2026-10-29
- 6Documentation | Mailtrap Help Centerdocs.mailtrap.io · read 2026-10-29
- 11SendGrid: declares "Email" (the record we read and signed)unfragile.ai · read 2026-10-24
- 12Mailgun (Activepieces): declares "send_email" (the record we read and signed)unfragile.ai · read 2026-10-24
- 13Resend (Activepieces): declares "send_batch_emails" (the record we read and signed)unfragile.ai · read 2026-10-24
For agents: the 10 actions behind this answer
Email · SendGrid verified and signed
send_email · Mailgun (Activepieces) verified and signed
Send Email — Send an email using your Mailgun domain
send_batch_emails · Resend (Activepieces) verified and signed
Send Batch Emails — Send up to 100 emails in a single API call
Sending · Sendmux A2A verified and signed
Send email and manage outbound attachments through Sendmux sending routes.
sendEmail · Maileroo (Activepieces) verified and signed
Send Email — Sends an email using the Maileroo API.
send-email · MCP Mailtrap Server found in code, not yet checked
Send an email to your recipient email address using Mailtrap Email API. You can send emails to multiple recipients at once.
sendEmail · primitive.dev verified and signed
Use this when the user has confirmed a new outbound email. Sends real email through Primitive's relay and can wait for the first SMTP delivery outcome.
· Mailkite website read, tools not yet checked
Receive any message as a webhook, send with one API across unlimited domains and mailboxes, free. No mail server, no MX/SPF/DKIM/DMARC to rebuild for every launch. The email platform for developers, teams, and the agents they build.
select_organization · agentmail-mcp verified and signed
Choose which organization your AgentMail operations target (for users who
· Sendinel website read, tools not yet checked
The email, SMS and social operations platform built for AI agents: campaigns, contacts and analytics over MCP and REST, on your own sending provider.
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.