Letter RoadFree plan available - no card required
Pay for storage. Not for seats.
Every plan includes unlimited people. Agent inboxes need a verified custom domain.
You are billed a fixed price for your selected storage and service plan. Adding people does not add per-seat charges. Eligible plans can add agent inboxes without per-seat charges.
How storage and billing work
Your selected plan sets the recurring price. All people and agent inboxes share its storage allowance. Monthly plans bill each month. Annual plans charge the full yearly amount shown below.
If full storage stops sending, delete stored mail to free space or choose a larger plan. Reaching the storage limit does not delete mail already stored in your account.
Selected plan
Growth selected. 25 GB of shared mail storage.
Compare the selected plan with the other allowances below.
Free
1 GB
Solo
20 GB
Starter
5 GB
Growth
25 GB
Scale
100 GB
Free
1 GB of storage
Free forever
Free opens sign-up with no payment.
- 1 GB of mail storage
- Free @ltrpost.com address when available
- No custom domains
- Unlimited people
- Mail search
- REST API and MCP access for an existing address
- OAuth access to an existing address
Solo
20 GB of storage
Monthly only
Solo is not available for purchase yet.
- 20 GB of mail storage
- 1 custom domain
- Unlimited people and agent inboxes
- Mail search
- Full REST API and MCP access
- Scoped agent tokens, audited on every call
Starter
5 GB of storage
- 5 GB of mail storage
- Up to 5 domains
- Unlimited people and agent inboxes
- AI compose and reply
- Mail search
- Full REST API and MCP access
Growth
25 GB of storage
- 25 GB of mail storage
- Unlimited domains
- Unlimited people and agent inboxes
- AI compose and reply
- Mail search
- Full REST API and MCP access
Scale
100 GB of storage
- 100 GB of mail storage
- Unlimited domains
- Unlimited people and agent inboxes
- AI compose and reply
- Mail search
- Priority support
Planning a larger rollout?
Let us understand your requirements.
Review our data processing terms and contact us about your team before you choose a plan.
Agents are not seats
Give every agent its own real address in one API call. Not a shared alias, not filtered access to a human's inbox - its own mailbox at your domain, with its own token. Agents are priced on storage and service rather than per seat, so a fleet of them does not multiply your bill the way adding users would.
You provision
Mint an admin key in Settings, then create each agent's mailbox and token with one REST call. The admin key stays with you - it can create and destroy mailboxes, so no agent ever holds it.
The agent runs itself
Hand it the token it was issued and it speaks MCP from then on: 16 tools for reading, searching, sending, replying, labelling and reporting its own usage.
You keep the leash
Every token is scoped to read, send or manage, rate limited on its own, and writes an audit entry on every call. Revoke one without touching the others.
On plans with custom domains, create agent inboxes without per-seat charges. Your plan's domain and shared storage limits apply.
See how an agent gets its addressCompare plans
Swipe sideways to compare every plan.Scroll sideways or use keyboard navigation to compare all plans.
Storage limits apply across your account. Service rate limits also apply.