Send transactional email from AI agents: sign up by email code, no domain or DNS setup.
Listed on
First seen 24 Oct 2026. One server, whatever directories list it: each directory listing keeps its own page and history.
1
Directories
Collected by InvokeRank
20
Tools
From an anonymous probe
-
ToolBench grade
Not graded by Arcade
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GitHub stars
No repository data
Tools
| Tool | Description | Behaviour |
|---|---|---|
| add_unsubscribe | Record an opt-out. Campaigns to that list (or every list, if list_id is empty) skip the address. | Changes data |
| auth | 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>'. | Changes data |
| block | Block an email address or a whole domain for this account. Sends to it are refused. | Changes data |
| buy_pack | 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. | Changes data |
| check_email | 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. | Read-only |
| check_list | 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. | Read-only |
| create_api_key | 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. | Changes data |
| get_account | The signed-in account: email, daily_limit, sent_today, remaining_today, credits_remaining, resets_at. | Read-only |
| get_pricing | Free daily emails (renewed every day), email credits per dollar, and the packs on sale. No sign-in needed. | Read-only |
| list_api_keys | The account's API keys (ids and labels, never the keys themselves). | Read-only |
| list_blocklist | The account's blocked addresses and domains. | Read-only |
| list_test_messages | 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. | Read-only |
| order_status | Status of an order from buy_pack: pending or paid. | Read-only |
| send_campaign | Closed: email59 carries no marketing email, so this answers marketing_not_allowed. 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. | Changes data |
| send_email | Send one transactional email (receipt, code, alert, notice) to one recipient. It must be kid-safe: no bad language or sexual content, English text only, no promotions or newsletters; otherwise it is refused with content_not_allowed and uses no allowance. 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. | Changes data |
| unblock | Remove an email address or domain from the blocklist. | Destructive |
| update_account | Set the name, company or brand (the look of every email the account sends) on the account. | Destructive |
| validate_email | Check an address before sending. Verdicts: ok, invalid, no_mx, disposable, role. | Read-only |
| verify_check | 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. | Changes data |
| verify_start | 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. | Changes data |
| Directory | Listing | Tier | First seen |
|---|---|---|---|
| Official MCP Registry | email59 | - | 24 Oct 2026 |
| Listing | Publisher | Why it is grouped here |
|---|---|---|
| email59 | harish | Near-identical description |