SentFromAI vs AgentMail
Agent inboxes at a lower fleet price.
Both platforms provide agent inboxes, two-way email, threading, and webhooks. SentFromAI Pro includes 100 inboxes for $19/mo; AgentMail Developer includes 10 for $20/mo. Compare individual features and limits before switching.
Compare inbox counts and plan limits
Both give your agents real inboxes and full two-way email. The difference shows up on the invoice — especially when you need inboxes at volume.
| Plan tier | SentFromAI | AgentMail |
|---|---|---|
| Free tier | 5 inboxes · 5,000 emails | 3 inboxes · 3,000 emails |
| Storage (free) | 5 GB | 3 GB |
| Entry paid plan | Pro — $19/mo | Developer — $20/mo |
| Inboxes (entry plan) | 100 | 10 |
| Emails/mo (entry plan) | 20,000 | 10,000 |
| Storage (entry plan) | 20 GB | 10 GB |
| Scale plan | Scale — $99/mo | Startup — $200/mo |
| Inboxes (scale plan) | 1,500 | 150 |
| Email allowance (scale plan) | 200,000/month | 15,000/day; monthly allowance not listed |
| Storage (scale plan) | 200 GB | Not listed; confirm with AgentMail |
| Business plan | Business — $299/mo · 15,000 inboxes · 600,000 emails · 600 GB | — |
| Overage / 1k emails | $1.00–$2.00 | Usage-based |
Checked September 25, 2026 against agentmail.to/pricing and SentFromAI pricing. AgentMail Startup lists 15,000 emails/day and 1,500 emails/5 minutes, but no monthly allowance or storage figure. Daily limits are not monthly allowances. Both offer custom Enterprise plans.
Shared email capabilities
Both platforms support the core workflows below. Shared capabilities do not imply identical APIs, limits, compliance options, or Enterprise features.
| Capability | SentFromAI | AgentMail |
|---|---|---|
| Programmatic inboxes per agent | ||
| Send & receive (two-way email) | ||
| Native threading & replies | ||
| Webhooks & WebSockets | ||
| Custom domains (SPF/DKIM/DMARC) | ||
| SMTP relay | ||
| SDKs & MCP server | ||
| Multi-tenant isolation | ||
| Dedicated sending IPs | Enterprise | Enterprise; contact sales |
Why teams switch to SentFromAI
Lower entry-plan cost
SentFromAI Pro is $19/mo for 100 inboxes and 20,000 emails. The closest AgentMail plan is $20/mo for 10 inboxes and 10,000 emails — you get 10× the inboxes for $1 less.
Inboxes that scale with agents
Agent fleets need an inbox per agent, not per team. SentFromAI Scale ships 1,500 inboxes for $99/mo — 10× the inboxes of a $200 competitor plan.
More storage on Free and Pro
SentFromAI includes 5 GB versus AgentMail’s 3 GB on Free, and 20 GB versus 10 GB on the entry paid plans. AgentMail does not list Startup storage on its current pricing page, so a scale-tier storage comparison needs confirmation.
Frequently asked questions
Does SentFromAI do real two-way email like AgentMail?+
Yes. Both platforms provide agent inboxes, sending and receiving, threads, replies, attachments, and webhooks. Compare the exact APIs, plan limits, and Enterprise requirements for your workflow.
How much cheaper is SentFromAI, really?+
At the entry paid tier, SentFromAI gives 100 inboxes for $19/mo versus 10 inboxes for $20/mo. At scale, it's 1,500 inboxes for $99/mo. If you run many agents, the inbox cost difference compounds quickly.
Is migrating from AgentMail hard?+
Migration effort depends on your integration. Compare inbox provisioning, message and thread IDs, webhook payloads, authentication, and domain setup. Test sending, receiving, and threaded replies before moving production traffic.
What about deliverability?+
Paid plans include custom domains with SPF, DKIM, and DMARC. Higher tiers add dedicated sending reputation and dedicated IPs for production-grade deliverability.
Give your agents inboxes — without the inbox-sized bill.
Start free with 5 inboxes and 5,000 emails. Upgrade to 100 inboxes for $19/mo whenever you're ready.