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Market around Letterbox

Open-source Rust terminal mail client for IMAP and Outlook accounts, with a TUI for reading email and an MCP interface that serves mail to AI agents.

Visit github.com ↗Pricing page ↗

Explore the market

Prices and medians update for the tier you select.

Compare at
Letterbox · Pro
No Pro plan
—
Pro-MCP server median
$15
across 7 priced MCP servers
vs Pro MCP servers
No comparison
Letterbox doesn't sell Pro
ⓘ Comparisons are same provider type (MCP server) and same buyer tier (Pro). Never across tiers.
Market density
81st pctile
80 competing vendors
Comparable listings · 30d
+3.7%
driven by postfleet $20→$7
MCP servers · Pro median
$15/mo
7 priced · $10–$20 mid 50%
Price spectrum · Pro plans · 7 of 11 providers priced · log scale · $2.92 → $99/mo
MCP servers◻ shaded = middle 50% · line = median (all types)Letterbox has no comparable Pro price — not plotted

Products in this market

Ranked by how closely each one matches Letterbox's job. Prices show each provider's Pro state; entry prices are labelled as such. Unpriced products still belong to the market.

MMCP servers48Ranked by similarity
Letterboxthis listing
● MCP
no public price
IMAP Agent Gateway
● MCP89% similar
no public price
IMAP MCP Server
● MCP89% similar
no public price
Fluxmail Cloud
● MCP88% similar
$10/mo Pro
-33% vs Pro median
xmail
● MCP88% similar
no public price
Mcpeemails Self Host
● MCP87% similar
$15/mo Pro
0% vs Pro median
Simple IMAP MCP
● MCP87% similar
no public price
Agent Mail Gateway
● MCP87% similar
no public price
Submail
● MCP86% similar
no public price
Universal Email MCP
● MCP86% similar
no public price
Email SMTP/IMAP MCP
● MCP85% similar
no public price
Imap
● MCP85% similar
no public price
Inboxapi
● MCP84% similar
no public price
Simple IMAP MCP Server
● MCP84% similar
no public price
AgentTrust
● MCP84% similar
no Pro plan
entry $9/mo
JH
JHJ-email-mcp
● MCP84% similar
no public price
Postkeep
● MCP84% similar
no public price
Outlook Assistant
● MCP84% similar
no public price
Kay's Mail MCP
● MCP84% similar
no public price
Chmel Mcp4mail
● MCP83% similar
no public price
Email Mcp 2
● MCP83% similar
no public price
mcp4mail
● MCP83% similar
no public price
Mail MCP
● MCP82% similar
no public price
Mailbox
● MCP82% similar
$2.92/mo Pro
-81% vs Pro median
Thunderbird Mail MCP
● MCP82% similar
no public price
Email Management MCP
● MCP82% similar
no public price
Mailbridge
● MCP82% similar
no public price
AgentMail
● MCP82% similar
no public price
Email
● MCP82% similar
no public price
Postern
● MCP82% similar
no public price
primitive.dev
● MCP82% similar
no Pro plan
entry $13/mo
AI Mail MCP
● MCP82% similar
no public price
Multi-Mail MCP
● MCP81% similar
no public price
Agentbox
● MCP81% similar
no public price
Mailyond
● MCP81% similar
$20/mo Pro
+33% vs Pro median
Email Engine
● MCP81% similar
no public price
Atomicmail
● MCP81% similar
no public price
Proton Mail Bridge MCP
● MCP81% similar
no public price
Titan Mail MCP
● MCP81% similar
no public price
em[ai]l
● MCP81% similar
$10/mo Pro
-33% vs Pro median
Oryah Mail
● MCP81% similar
no Pro plan
entry $1/mo
Postfleet MCP
● MCP81% similar
no public price
Send16
● MCP81% similar
$99/mo Pro
+560% vs Pro median
Mailbox
● MCP80% similar
no public price
Postfleet
● MCP80% similar
$20/mo Pro
+33% vs Pro median
MCP Infomaniak POC
● MCP80% similar
no public price
GigaMail
● MCP80% similar
no public price
MCP IMAP/SMTP
● MCP80% similar
no public price
OOther1Ranked by similarity
emitd
● OTHER81% similar
no public price
AAPIs1Ranked by similarity
Sendcore
● API80% similar
no Pro plan
entry $19/mo

Market = the products most similar to this one by capability; prices are median / quartiles over its priced members, separated by provider type and buyer tier.