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mailfloss

by com.mailfloss
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Server Details

Email verification for AI agents: verify addresses and lists, check credits, manage integrations.

Ownership verified
Status
Healthy
Uptime
100.0% over the last 24 hours
Last Tested
Transport
Streamable HTTP · MCP 2025-11-25
URL
ChatGPT
–
Claude
mailfloss

TDQS

A3.8/5.0

Scored across 16 tools

Disambiguation4/5

Most tools target distinct resource+action combinations (batch status vs. batch results vs. cancel; resync vs. test vs. update_settings on connections), and the descriptions clarify the boundaries. The only mild overlap is get_account (profile/security) vs. get_organization (plan/credits/usage), which an agent could confuse when looking for account-level data.

Naming Consistency5/5

All 16 tools follow a consistent snake_case verb_noun pattern (get_*, list_*, start_*, cancel_*, test_*, update_*, disconnect_*, resync_*, verify_email). Naming is predictable and readable throughout, with no mixed conventions.

Tool Count4/5

16 tools is at the upper edge but justified: verification (single and batch), job history, and a full integration/connection lifecycle each contribute distinct operations. Slightly heavy, but no tool feels redundant given the breadth of the domain.

Completeness4/5

Strong coverage of verification workflows (start/status/results/cancel, single-email verify, usage reports) and integration management (list/get/disconnect/resync/test/update settings). The main gap is that there is no tool to create or connect a new integration/connection — presumably handled via external OAuth — leaving a lifecycle dead-end.

Publisher details

Operator
mailfloss · Publisher source
Operator website
https://mailfloss.com
Vendor relationship
First-party
Documentation
https://developers.mailfloss.com/mcp
Trust center
Not available
Restrictions
Requires a mailfloss account (free plan includes 500 verifications a month). Sign in with OAuth or send an API key as a Bearer token.

Available Tools

16 tools
cancel_batchCancel a batch jobA
Destructive
Inspect

Stop a running batch verification job (POST /v1/batch-verify/{id}/cancel). CHANGES THE ACCOUNT: unprocessed emails are not verified and their credits are refunded.

Inputs: id (required).

disconnect_integrationDisconnect an integrationA
Destructive
Inspect

Disconnect a connection (DELETE /v1/integrations/{type}/connections/{id}). CHANGES THE ACCOUNT: all cleaning for that connection stops. Instafloss-enabled connections return 409.

Inputs: id (required), type (required).

get_accountGet account holderB
Read-onlyIdempotent
Inspect

The account holder's profile and security posture (GET /v1/account). Free.

Inputs: no named parameters.

get_batch_resultsGet batch job resultsA
Read-onlyIdempotent
Inspect

Per-email verdicts of a batch job, paginated (GET /v1/batch-verify/{id}/results). Pass next from the previous page to continue. Free.

Inputs: id (required), next.

get_batch_statusGet batch job statusA
Read-onlyIdempotent
Inspect

Progress counters and state of a batch verification job (GET /v1/batch-verify/{id}/status). Free.

Inputs: id (required).

get_connectionGet a connectionB
Read-onlyIdempotent
Inspect

One connection of an integration, with its settings (GET /v1/integrations/{type}/connections/{id}). Free.

Inputs: id (required), type (required).

get_integrationGet an integrationA
Read-onlyIdempotent
Inspect

One integration type with all of its connections and their settings (GET /v1/integrations/{type}). Free.

Inputs: type (required).

get_organizationGet organizationA
Read-onlyIdempotent
Inspect

The caller's organization: plan, credits remaining, usage and account status (GET /v1/organization). Free.

Inputs: no named parameters.

get_usage_reportGet usage reportB
Read-onlyIdempotent
Inspect

Verification usage for a calendar period with status and reason breakdowns (GET /v1/reports/usage). Free.

Inputs: period, connection_id.

list_integrationsList integrationsA
Read-onlyIdempotent
Inspect

All supported email-service integrations with connected flags and connection counts (GET /v1/integrations). Free.

Inputs: cursor, per_page.

list_jobsList verification jobsA
Read-onlyIdempotent
Inspect

Paginated history of verification jobs from every source, newest first (GET /v1/jobs). Free.

Inputs: cursor, source, status, per_page.

resync_integrationRe-sync an integrationA
DestructiveIdempotent
Inspect

Re-validate a connection's stored credentials against the ESP and refresh its audiences/lists (POST /v1/integrations/{type}/connections/{id}/sync). Changes stored audience data only; spends no credits.

Inputs: id (required), type (required).

start_batch_verificationStart a batch verification jobA
Destructive
Inspect

Submit a list of email addresses for asynchronous verification (POST /v1/batch-verify). SPENDS 1 CREDIT PER EMAIL. Returns the job id.

Inputs: emails (required), webhook_url.

test_integrationTest an integrationA
Idempotent
Inspect

Check whether a connection's stored credentials still work with a live probe against the ESP (POST /v1/integrations/{type}/connections/{id}/test). Changes no settings or lists, but may renew an expiring OAuth token. Free.

Inputs: id (required), type (required).

update_settingsUpdate connection settingsA
Destructive
Inspect

Partially update a connection's cleaning settings — manual_mode, autofloss, decay_protection, aggressiveness, per-check gates (PATCH /v1/integrations/{type}/connections/{id}). CHANGES THE ACCOUNT and can change which subscribers get removed. Omitted fields are left unchanged.

Inputs: id (required), type (required), action, checks, +4 more.

verify_emailVerify an email addressA
Destructive
Inspect

Verify a single email address in real time (GET /v1/verify). SPENDS 1 CREDIT per call, including repeats of the same address. Returns status (passed | undeliverable | risky | unknown), reason and passed.

Inputs: email (required), timeout.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

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