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email59

com.email59/email59email59.comstreamable-httpv0.5.0Scanned

Send transactional email from AI agents: sign up by email code, no domain or DNS setup.

20 tools: 2 can delete or cancel things, 4 do something that can't be undone, 6 change things and 8 only read.

Tools: 2 delete, 4 irreversible, 6 write, 8 read.
  • Reads private data · 4
  • Reads text others write · 12
  • Can send data out · 4
  • No findings

Anlyon alternative

12 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

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Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

20 tools

Deletes or cancels 2Claude Code: deny
  • unblockRemove an email address or domain from the blocklist.No findings

    Why it is in this group

    • The description's first verb is "remove": a word for removing or ending something.
    • The server marks it destructive (destructiveHint: true).
    Description, as the server wrote it
    Remove an email address or domain from the blocklist.

    Annotations the server declares

    • title: Unblock an address or domain
    • readOnlyHint: false
    • destructiveHint: true
    • idempotentHint: true
    • openWorldHint: false
  • update_accountSet the name, company or brand (the look of every email the account sends) on the account.No findings

    Why it is in this group

    • The name "update_account" says "update": a word for a change.
    • The server marks it destructive (destructiveHint: true).
    Description, as the server wrote it
    Set the name, company or brand (the look of every email the account sends) on the account.

    Annotations the server declares

    • title: Update account name, company or brand
    • readOnlyHint: false
    • destructiveHint: true
    • idempotentHint: true
    • openWorldHint: false
Can't be undone 4Claude Code: ask
  • send_campaignSend a marketing email to up to 1,000 recipients; the unsubscribe link is added for you.Reads text others writeCan send data outNo findings

    Why it is in this group

    • The name "send_campaign" says "send": a word for sending, and what is sent cannot be taken back.
    • The input addresses people (input.recipients): what it sends cannot be taken back.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    • outboundThe name "send_campaign" says "send": it sends or publishes something to other people.
    • outboundThe input takes a destination (input.recipients): what the tool writes goes there.
    Description, as the server wrote it
    Send a marketing email to up to 1,000 recipients; the unsubscribe link is added for you. Invalid, role, blocked or unsubscribed recipients are skipped and cost nothing; each accepted recipient uses 1 email of today's allowance. A campaign that doesn't fit what's left today is refused whole.

    Annotations the server declares

    • title: Send a marketing campaign
    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: false
    • openWorldHint: true
  • send_emailSend one email to one recipient: transactional (receipt, code, alert) or marketing (category).Reads text others writeCan send data outNo findings

    Why it is in this group

    • The name "send_email" says "send": a word for sending, and what is sent cannot be taken back.
    • The input addresses people (input.to): what it sends cannot be taken back.
    • The input takes a statement or command to run (input.code), which can change anything it can reach.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    • outboundThe name "send_email" says "send": it sends or publishes something to other people.
    • outboundThe input takes a destination (input.to): what the tool writes goes there.
    • outboundThe input takes a URL (input.brand.url): a request to a URL can carry data to whoever runs it.
    Description, as the server wrote it
    Send one email to one recipient: transactional (receipt, code, alert) or marketing (category). It goes out as HTML in a branded template with a text part; give text, html or both. Uses 1 email of today's allowance. Many recipients at once: send_campaign.

    Annotations the server declares

    • title: Send an email
    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: false
    • openWorldHint: true
  • verify_checkCheck a code from verify_start.Can send data outNo findings

    Why it is in this group

    • The input addresses people (input.to): what it sends cannot be taken back.
    • The input takes a statement or command to run (input.code), which can change anything it can reach.

    What it can reach

    • outboundThe input takes a destination (input.to): what the tool writes goes there.
    Description, as the server wrote it
    Check a code from verify_start. Give to (checks the newest code sent there) or id, and code. Returns valid true or false and a status: approved, wrong_code, expired, too_many_attempts (5 wrong codes lock it), already_used, replaced or not_found. A right code works once. Uses no allowance.

    Annotations the server declares

    • title: Check a verification code
    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: false
    • openWorldHint: false
  • verify_startEmail a one-time verification code to an address (sign-up, sign-in, confirming an email).Reads text others writeCan send data outNo findings

    Why it is in this group

    • The name "verify_start" says "start": a word for a change.
    • The input addresses people (input.to): what it sends cannot be taken back.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    • outboundThe input takes a destination (input.to): what the tool writes goes there.
    Description, as the server wrote it
    Email a one-time verification code to an address (sign-up, sign-in, confirming an email). email59 makes the code, sends it, limits resends and expires it; the code is never returned to you. Returns an id. Uses 1 email of today's allowance. A new code to the same address replaces the one waiting there. Then call verify_check with what the person typed.

    Annotations the server declares

    • title: Send a verification code
    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: false
    • openWorldHint: true
Changes things 6Claude Code: ask
  • add_unsubscribeRecord an opt-out.No findings

    Why it is in this group

    • The name "add_unsubscribe" says "add": a word for a change.
    Description, as the server wrote it
    Record an opt-out. Campaigns to that list (or every list, if list_id is empty) skip the address.

    Annotations the server declares

    • title: Record an unsubscribe
    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • authSign up or sign in to email59.Reads text others writeNo findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Sign up or sign in to email59. Pass email to have a 6-digit code emailed, then call again with email and otp to get a session key (a new email is signed up with 200 free emails a day). Or pass api_key to swap an API key for a session key. Send the key as the HTTP header 'Authorization: Bearer <session_key>'.

    Annotations the server declares

    • title: Sign in to email59
    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: false
    • openWorldHint: true
  • blockBlock an email address or a whole domain for this account.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Block an email address or a whole domain for this account. Sends to it are refused.

    Annotations the server declares

    • title: Block an address or domain
    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • buy_packStart buying a pack (pack_5 = $5, pack_10 = $10, pack_50 = $50; each $1 adds 3,636 email credits, which don't renew and last until used, plus a purchase fee of 5% or at least $0.50…Reads text others writeNo findings

    Why it is in this group

    • The description's first verb is "start": a word for a change.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Start buying a pack (pack_5 = $5, pack_10 = $10, pack_50 = $50; each $1 adds 3,636 email credits, which don't renew and last until used, plus a purchase fee of 5% or at least $0.50 at checkout; GET /v1/pricing has the totals). Returns a checkout_url for a person to pay; the credits arrive once the payment clears. First show the person the refund policy and terms from GET /v1/policy; pass agree=true and its version only after they agree.

    Annotations the server declares

    • title: Start buying an email pack
    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: false
    • openWorldHint: true
  • check_emailFree deep check of an email address, no sign-in needed: format, provider username rules, disposable and role addresses, and the domain's MX, SPF, DMARC, DKIM, MTA-STS, TLS-RPT and …Reads text others writeNo findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Free deep check of an email address, no sign-in needed: format, provider username rules, disposable and role addresses, and the domain's MX, SPF, DMARC, DKIM, MTA-STS, TLS-RPT and BIMI records. Returns a report with a score (0-99, likelihood the address is real) and a verdict (likely_valid, risky, likely_invalid, unknown). Gmail, Outlook and other big providers skip DNS. No email is sent.

    Annotations the server declares

    • title: Deep-check an email address
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • create_api_keyCreate a long-lived API key (max 10 per account).No findings

    Why it is in this group

    • The name "create_api_key" says "create": a word for a change.
    Description, as the server wrote it
    Create a long-lived API key (max 10 per account). It is shown only once. mode 'test' makes an e59_test_ key for staging and CI: its sends are accepted and stored, never delivered, and use no allowance.

    Annotations the server declares

    • title: Create an API key
    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: false
    • openWorldHint: false
Only reads 8Show 8 read-only tools
  • check_listList check for a mailing list: up to 1,000 different addresses a call, as emails or the text of a CSV (the column headed email).Reads private dataReads text others writeNo findings

    Why it is in this group

    • The name "check_list" says "list": a word for reading.

    What it can reach

    • private-dataThe description's first sentence says "list" and "email": it reads mail.
    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    • untrusted-inputThe description's first sentence says "list" and "email": it reads inbound email, which other people can write.
    Description, as the server wrote it
    List check for a mailing list: up to 1,000 different addresses a call, as emails or the text of a CSV (the column headed email). One status each: valid, risky, role, disposable, no_mx or invalid, with a reason, plus counts per status. Format, provider rules and one MX lookup per domain; no email is sent. Daily limit per account; the answer's quota shows what is left today.

    Annotations the server declares

    • title: Check a mailing list
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • get_accountThe signed-in account: email, daily_limit, sent_today, remaining_today, credits_remaining, resets_at.Reads private dataReads text others writeNo findings

    Why it is in this group

    • The name "get_account" says "get": a word for reading.

    What it can reach

    • private-dataThe description's first sentence says "email": it reads mail.
    • untrusted-inputThe description's first sentence says "email": it reads inbound email, which other people can write.
    Description, as the server wrote it
    The signed-in account: email, daily_limit, sent_today, remaining_today, credits_remaining, resets_at.

    Annotations the server declares

    • title: Get account
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • get_pricingFree daily emails (renewed every day), email credits per dollar, and the packs on sale.Reads private dataReads text others writeNo findings

    Why it is in this group

    • The name "get_pricing" says "get": a word for reading.

    What it can reach

    • private-dataThe description's first sentence says "email": it reads mail.
    • untrusted-inputThe description's first sentence says "email": it reads inbound email, which other people can write.
    Description, as the server wrote it
    Free daily emails (renewed every day), email credits per dollar, and the packs on sale. No sign-in needed.

    Annotations the server declares

    • title: Get pricing
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • list_api_keysThe account's API keys (ids and labels, never the keys themselves).No findings

    Why it is in this group

    • The name "list_api_keys" says "list": a word for reading.
    Description, as the server wrote it
    The account's API keys (ids and labels, never the keys themselves).

    Annotations the server declares

    • title: List API keys
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • list_blocklistThe account's blocked addresses and domains.No findings

    Why it is in this group

    • The name "list_blocklist" says "list": a word for reading.
    Description, as the server wrote it
    The account's blocked addresses and domains.

    Annotations the server declares

    • title: List blocked addresses
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • list_test_messagesEmails sent with a test key (e59_test_...), newest first: accepted, stored, never delivered.Reads private dataReads text others writeNo findings

    Why it is in this group

    • The name "list_test_messages" says "list": a word for reading.

    What it can reach

    • private-dataThe name "list_test_messages" says "list" and "message": it reads messages.
    • private-dataThe description's first sentence says "email": it reads mail.
    • untrusted-inputThe name "list_test_messages" says "list" and "message": it reads messages, which other people can write.
    • untrusted-inputThe description's first sentence says "email": it reads inbound email, which other people can write.
    Description, as the server wrote it
    Emails sent with a test key (e59_test_...), newest first: accepted, stored, never delivered. Pass id for one email with its html and text (a verify_start code is in there), or to to filter by recipient.

    Annotations the server declares

    • title: List test-key emails
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • order_statusStatus of an order from buy_pack: pending or paid.Reads text others writeNo findings

    Why it is in this group

    • The name "order_status" says "status": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Status of an order from buy_pack: pending or paid.

    Annotations the server declares

    • title: Get order status
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • validate_emailCheck an address before sending.Reads text others writeNo findings

    Why it is in this group

    • The name "validate_email" says "validate": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Check an address before sending. Verdicts: ok, invalid, no_mx, disposable, role.

    Annotations the server declares

    • title: Validate an email address
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

192 paths in this server alone from private data, through text someone else wrote, to a way out. Denying 4 outbound tools breaks every one.

Reads private data4
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write12
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out4
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.
deny to break every path
{
  "permissions": {
    "deny": [
      "mcp__email59__send_campaign",
      "mcp__email59__send_email",
      "mcp__email59__verify_check",
      "mcp__email59__verify_start"
    ]
  }
}

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Findings

Matches of fixed checks, with the text they matched.

No check matched anything in these tool definitions. That is not a safety guarantee.

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 0.5.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http email59 https://email59.com/v1/mcp
claude mcp add --transport http email59 https://email59.com/v1/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__email59__get_pricing",
      "mcp__email59__get_account",
      "mcp__email59__check_list",
      "mcp__email59__validate_email",
      "mcp__email59__list_blocklist",
      "mcp__email59__order_status",
      "mcp__email59__list_test_messages",
      "mcp__email59__list_api_keys"
    ],
    "ask": [
      "mcp__email59__auth",
      "mcp__email59__send_email",
      "mcp__email59__send_campaign",
      "mcp__email59__check_email",
      "mcp__email59__block",
      "mcp__email59__add_unsubscribe",
      "mcp__email59__buy_pack",
      "mcp__email59__create_api_key",
      "mcp__email59__verify_start",
      "mcp__email59__verify_check"
    ],
    "deny": [
      "mcp__email59__update_account",
      "mcp__email59__unblock"
    ]
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as email59. Review it before you use it.

Capability tags behind 13 rules
  • mcp__email59__auth untrusted-input
  • mcp__email59__get_pricing private-data, untrusted-input
  • mcp__email59__get_account private-data, untrusted-input
  • mcp__email59__send_email untrusted-input, outbound
  • mcp__email59__send_campaign untrusted-input, outbound
  • mcp__email59__check_email untrusted-input
  • mcp__email59__check_list private-data, untrusted-input
  • mcp__email59__validate_email untrusted-input
  • mcp__email59__buy_pack untrusted-input
  • mcp__email59__order_status untrusted-input
  • mcp__email59__list_test_messages private-data, untrusted-input
  • mcp__email59__verify_start untrusted-input, outbound
  • mcp__email59__verify_check outbound

Pin

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/com.email59/email59/verify?hash=ee66afb6c3c5cb36627856b4ad470905dff38946243aeac7e6f8f41bb99e25e5" | jq -e '.changed == false'

Pinned hash ee66afb6c3c5, from Oct 24, 2026, 09:17 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/com.email59/email59/changes.xml

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Badge

anlyon.dev badge for com.email59/email59
[![anlyon.dev](https://anlyon.dev/badge/com.email59/email59.svg)](https://anlyon.dev/servers/com.email59/email59)

Source: MCP Registry. Synced Oct 24, 2026, 09:17 UTC.