Sentvia vs Mails.ai
Mails.ai runs campaigns. Sentvia gives agents an inbox API.
Mails.ai is a cold-outreach app for human sales teams — warmup, sequences, an AI writer. Sentvia is email infrastructure for AI agents: programmatic inboxes, two-way email, and a REST API with SDKs and MCP.
Different jobs, different primitives
Mails.ai automates human cold-email campaigns. Sentvia is programmatic email infrastructure your agents call directly.
| Capability | Sentvia | Mails.ai |
|---|---|---|
| Programmatic inboxes per agent | ||
| REST API + Python/TS SDKs | ||
| MCP server for agents | ||
| Two-way email (inbox object) | Replies to campaign UI | |
| Persistent threads & memory | ||
| Real-time webhooks & WebSockets | ||
| Custom domains (SPF/DKIM/DMARC) | Tracking domain | |
| Deliverability warmup & rotation | Reputation tooling | |
| AI campaign writer & sequences | ||
| Multi-tenant isolation |
Priced per developer plan, not per outreach seat
Mails.ai prices by active contacts for a sending UI. Sentvia prices by inboxes and API volume for the agents you run.
| Plan tier | Sentvia | Mails.ai |
|---|---|---|
| Free tier | 3 inboxes · 3,000 emails | Warmup only · no campaigns |
| Entry paid plan | Pro — $19/mo | Startup — $49/mo |
| What you get | 100 programmatic inboxes | 1,000 active contacts |
| Send volume (entry) | 15,000 emails/mo | Unlimited sends |
| Mid plan | Scale — $99/mo · 1,500 inboxes | Growth — $99/mo · 5,000 contacts |
| Top plan | Business — $299/mo · 15,000 inboxes | Pro — $199/mo · unlimited contacts |
| Built for | AI agents via API | Humans running campaigns |
Mails.ai pricing per mails.ai/pricing (monthly billing, June 2026). Sentvia pricing per current plans. Categories differ — figures for orientation, not a like-for-like swap.
Why agent builders choose Sentvia
An API, not a campaign dashboard
Mails.ai is a UI where a human uploads leads and launches sequences. Sentvia exposes a REST API, Python and TypeScript SDKs, and an MCP server so an agent provisions inboxes and sends mail in code.
Real two-way inboxes per agent
Agents need to receive, thread, and reply with their own identity. Sentvia gives each agent a persistent inbox object with webhooks — not replies funneled into a marketing inbox.
Infrastructure that scales with fleets
Per-agent identity and multi-tenant isolation are built in. Sentvia Scale ships 1,500 inboxes for $99/mo — built for fleets of agents, not a team of human senders.
Sentvia vs Mails.ai — common questions
Is Mails.ai a competitor to Sentvia?+
They solve different problems. Mails.ai is cold-outreach software for human sales teams — warmup, AI-written sequences, and inbox rotation through a UI. Sentvia is programmatic email infrastructure that AI agents call via API to get their own inboxes and two-way email.
Can I build an AI agent on Mails.ai?+
Not really. Mails.ai is a campaign application without a public programmatic email API, per-agent inboxes, or an MCP server. Sentvia is API-first and designed for autonomous agents.
Does Sentvia do warmup and deliverability?+
Sentvia includes custom domains with SPF, DKIM, and DMARC, plus dedicated sending reputation on higher tiers. It focuses on production deliverability for agent traffic rather than human cold-campaign warmup pools.
How does pricing compare?+
Mails.ai starts at $49/mo (Startup, 1,000 active contacts) and prices by contacts for a sending UI. Sentvia Pro is $19/mo for 100 programmatic inboxes including two-way receiving, priced for the agents you run.
Building agents, not running campaigns? Give them an inbox API.
Start free with 3 inboxes and 3,000 emails. Upgrade to 100 inboxes for $19/mo when you're ready.