Your WhatsApp Business inbox in Claude or ChatGPT: who's waiting, follow-ups and replies.
Design emails from a brief, send tests, send to your lists now or scheduled, and read delivery.
Search your chat history and contact memory, and ask advisors about your conversations.
Pay-per-call TLS certificate, DNS/email-auth and domain-expiry checks for any domain (x402 USDC).
Verify email addresses before you send: honest verdicts, no address kept, EU-hosted.
Product analytics, feature flags, experiments, session replay and messaging for your products.
Send real faxes from AI chat. PDF, JPG or PNG. Pay per fax via Stripe link. US, CA, AU, NZ + 39.
Send faxes from AI chat with prepaid credits (1 credit = 1 fax, up to 100 pages). PDF, JPG, PNG.
Fax PDFs/photos to Japan from Claude/ChatGPT. OAuth: pay per fax from ¥400 or credits. AIから日本へFAX.
Read, search, organize, draft and send business email from your SuperMailOS mailboxes.
Check whether an email address is real and will accept mail before you send to it.
Does ChatGPT recommend a local business? Live AI-engine check plus who gets named instead.
Reach other people, and the AIs they use, from any app: message them, ask for a yes, agree a time.
Send real faxes from AI chat (DE/AT + 40 countries). PDF, JPG, photo. Pay per fax via Stripe.
Send faxes from AI chat with prepaid credits (1 credit = 1 fax, up to 40 pages). DE/AT + 40 more.
Fax from ChatGPT/Claude with OAuth sign-in: pay per fax or KI credits. DE/AT + 40 countries.
Email inboxes for agents by the hour: wait for a mail, get the code or link. Pay per call.
Checks if an email/domain is disposable (temp-mail). x402-metered per call.
Firmfold: company enrichment by domain/email/name: logo, tech, contacts, jobs, firmographics.
Mailvett: validate emails. MX, provider, disposable/role/free flags, typo fix, verdict.
Weekly client reports: change, % change, targets, status, printable page and email text. Free.
Letterkeel: send email from your own domain via SMTP, Resend, SendGrid, Mailgun, Postmark.
Hollerdex: a domain's public emails, phones and social profiles as one ranked contact card.
Check a domain's email authentication: SPF, DKIM, DMARC, BIMI, MX, MTA-STS, TLS-RPT. Score + fixes.
About Communication MCP servers
Communication servers put an agent inside the channels your team already uses. They expose tools to search message history, post to channels or threads, send and draft email, manage contacts and react to incoming messages, covering Slack, Discord, Microsoft Teams, Gmail and IMAP mailboxes, Twilio-style SMS and voice, and chat platforms such as Telegram and WhatsApp.
Sending on someone's behalf is a high-trust action, so look for servers that separate read tools from write tools, support draft-before-send flows and scope access to specific channels or mailboxes. OAuth-based servers are easier to revoke than shared bot tokens. For inbound automation, pair a communication server with a workflow or webhook server.