Send an email on behalf of a user to a prospect
send-email
Recommended
AgentMail
by agentmail.devPurpose-built for AI agents sending email. API-first, no SMTP config needed, inbox management included.
Auth: api_key
Setup: low
Pricing: Free tier: 100 emails/day. Pro starts at $29/mo.
Example API call
POST https://api.agentmail.dev/v1/send
{
"to": "prospect@company.com",
"from": "you@yourdomain.com",
"subject": "Quick question about your pipeline",
"body": "Hi Alex, I noticed your team recently expanded..."
}
// Response:
{
"id": "msg_abc123",
"status": "sent",
"delivered_at": "2026-03-19T10:30:00Z"
}Alternatives
Instantlyby instantly.ai
Best for high-volume cold outreach with built-in warmup and deliverability optimization.
Create, read, and manage email inboxes programmatically
manage-inbox
Recommended
AgentMail
by agentmail.devCreate and manage inboxes via API. Each inbox gets a real email address. Read, search, and organize messages.
Auth: api_key
Setup: low
Pricing: Free tier: 3 inboxes. Pro starts at $29/mo.
Example API call
POST https://api.agentmail.dev/v1/inboxes
{
"name": "Sales Outreach",
"domain": "yourdomain.com"
}
// Response:
{
"id": "inbox_xyz789",
"email": "sales@yourdomain.com",
"created_at": "2026-03-19T10:00:00Z"
}