Instantly
Stands out: Warmup, unibox, and volume send with hosted MCP and a public API.
Watch out: Deliverability still depends on your domains and inboxes, not the tool alone.
Not the right fit for
- Teams that only need LinkedIn messaging
- Buyers looking for an ATS
Mailercloud
Stands out: A hosted MCP server lets Claude, ChatGPT or Cursor run campaigns, contacts and stats using your Mailercloud API key.
Watch out: Premium is priced by contact count, so 10,000 contacts cost about $50/mo. The transactional Email API is billed separately from $7/mo.
Not the right fit for
- Sales teams that need cold email sequences
- Senders who want pay-per-email pricing