Mailcheck
· #366 most-usedVerify every email before it costs you a bounce
Mailcheck is a real-time email verification API that tells you instantly whether an address is deliverable, disposable, role-based, a typo variant, or a catch-all domain — before you send a single message. Connect it to Actionist and your agents can scrub sign-up forms the moment a user types, bulk-clean lead lists before a campaign fires, react to verification webhooks in real time, and revoke API keys the instant suspicious activity is detected. Clean data in, clean results out.
Eliminates manual work. Connecting Mailcheck removes the back-and-forth of exporting contact lists, running verification passes, reviewing results, and updating CRM records — a cycle that compounds across every campaign and sign-up flow.
What your Mailcheck agent runs on autopilot
A week of scheduled jobs your Actionist agent will execute on your behalf.
Mailcheck × every other app you use
End-to-end automations that span multiple apps — each one a real business outcome.
Clean inbox, confident reply
When a Gmail bounce notification lands in your inbox, the agent pulls the offending address through Verify single email — surfacing whether the failure was a typo, a deactivated mailbox, or a disposable domain. It posts the verdict and a corrected address suggestion to a Slack thread, then drops a follow-up task on the Google Calendar so a rep loops back within 24 hours. No more chasing ghost addresses by hand.
Time saved for your team — every week, on autopilot
Savings
What your team gets back — two angles: what you stop doing manually, and what that's worth.
What you do manually today
What your agent runs for you
- Sales19 min / weekManual lead scrubbing
Rep exports CSV, pastes into a free verifier, waits, re-imports, and dedupes — 19 minutes per list, every campaign.
Sales Agent0 minAgent verifies and routes instantlyAgent uploads the list, polls until done, downloads the clean CSV, and pushes valid contacts straight to the outreach queue.
- Marketing14 min / weekPre-send bounce review
Marketer manually spot-checks email lists before scheduling a campaign, often missing invalid addresses that cause deliverability hits.
Marketing Agent0 minAgent gates every campaign sendAgent bulk-verifies the recipient list automatically when a campaign is scheduled and suppresses invalid addresses before the send window opens.
- Customer Support19 min / weekChasing bounced tickets
Support rep manually searches for a contact's correct email after a ticket reply bounces, then updates the CRM record by hand.
Customer Support Agent0 minAgent resolves bounce immediatelyAgent catches the bounce notification, runs Verify single email, surfaces a typo suggestion, and posts the corrected address to the rep's Slack thread in under a minute.
- Human Resources8 min / weekCandidate email validation
HR coordinator manually checks whether a candidate's email is reachable before sending an offer — often by sending a test message and waiting.
Human Resources Agent0 minAgent validates before outreachAgent runs Verify single email the moment a candidate record is created, flags disposable or invalid addresses, and annotates the ATS record automatically.
- Finance14 min / weekVendor email audit
AP team manually confirms vendor contact emails are still active before the monthly invoice run, using test sends or phone calls.
Finance Agent0 minAgent pre-validates vendor contactsAgent runs a pre-invoice verification pass on all vendor emails, tags stale addresses in HubSpot, and files a GitHub issue for any that need correction before payment.
- Operations30 min / weekImport-time email QA
Ops team manually reviews new contact imports in bulk, flagging obvious invalid formats but missing disposable domains and catch-alls entirely.
Operations Agent0 minAgent gates every import rowAgent verifies each new email the moment a row lands in the master Google Sheet and routes valid contacts to the CRM while flagging risky ones for manual disposition.
- Legal6 min / weekContract signer reachability
Legal team manually confirms counterparty email addresses before sending DocuSign envelopes, often catching bad addresses only after a failed delivery.
Legal Agent0 minAgent verifies before envelope sendAgent calls Verify single email on every contract signer the moment a new deal is logged, catches unreachable addresses, and alerts legal before the envelope is dispatched.
Calculate what your team saves
Based on Mailcheck's typical team usage — the visible tasks plus a few other automations the agent runs: ~2.8 hrs / person / week of admin work automated.
How to plug Mailcheck into Actionist
Pick the connection method that suits your environment.
The Mailcheck MCP server is the fastest way to connect — no manual key management, no raw HTTP calls. Actionist handles the protocol handshake and exposes every Mailcheck operation directly to your agents.
Find Mailcheck in the Apps library and click Connect. MCP is selected by default.
Actionist opens a secure authorisation prompt. Sign in to your Mailcheck account at mailcheck.co and approve access — no key copying required.
Actionist runs a read-only call to verify the handshake. You're ready.
15 action your agent can call
Read and write operations available to your Actionist agent.
6 events your agent can react to
Events your agent watches for, and the actions it kicks off in response.
Skills that pair with Mailcheck
Reusable agent skills that work well alongside this app.
Consult this skill when debugging Mailcheck API connectivity, inspecting DNS MX records behind a catch-all verdict, testing webhook endpoints with curl, or diagnosing SSL issues on your listener URL.
MCP servers that work with Mailcheck
Connect Actionist to MCP servers built for or around this app.