Cold email infrastructure

Domains, mailboxes and sending — behind one API.

sendzy buys your sending domains, provisions the mail servers, and gives your team — and your agents — a clean REST surface and MCP server to launch cold email campaigns.

Get started Read the docs

Domains on demand

Register domains straight from the console or the API. Each domain lands on your own private mail server — fully managed, nothing to run.

Mailboxes at scale

Three mailboxes per domain, one or many instances. Custom SMTP/IMAP overrides when you bring your own infrastructure.

Send and track

SMTP sending, IMAP inbox sync, and thread-grouped conversations. Everything your cold email workflow needs behind one REST surface.

REST

One API key away

Create multiple API keys, scope them to your organization, and call the public endpoints from anywhere.

API reference

terminal

curl -X POST https://app.sendzy.dev/api/mails/send-email \
  -H "X-Api-Key: sk_yourkey" \
  -H "Content-Type: application/json" \
  -d '{
    "mailbox_id": "mbx_123",
    "to": "prospect@target.com",
    "subject": "Quick question",
    "body": "Hey — worth a chat?"
  }'

MCP

Point Claude or Cursor at your cold email stack.

The sendzy MCP server exposes every public API as tools — domains, mailboxes, inbox, threads, sending. One URL, one API key.

Works with your favorite agents.

and more

Pricing

Private infrastructure, honest pricing.

Starter

$59/mo

For teams starting cold outbound.

50K emails and contacts
1 free domain + 3 mailboxes (private infrastructure)
Multi-step campaigns with CSV lists
Email verification and domain checking
REST API + MCP server

Start with Starter