MailVakt

By MailVakt

Overview

MailVakt helps you troubleshoot email deliverability and authentication directly from Claude. Investigate why emails may land in spam, check your domain’s DNS configuration, and get actionable recommendations for improving email security. Use MailVakt to: - Audit email authentication: Check SPF, DKIM, DMARC, MX records and domain alignment, plus BIMI, MTA-STS and TLS-RPT configuration. - Check blocklists: Look for domain and sending-IP listings on supported free public blocklists. - Analyze email headers: Inspect reported authentication results, sending IPs and alignment to identify potential delivery problems. - Generate DNS recommendations: Get proposed email authentication records and provider-specific setup guidance for monitoring or enforcement. - Test email receipt: Create a test address, send it an email, and inspect authentication, unsubscribe, content and deliverability findings. - Monitor DMARC reports: Add domains to your MailVakt account and summarize collected aggregate reports, including message volumes, pass/fail counts, sending sources and receiver actions. Ask Claude: “Check my domain’s email authentication,” “Analyze these email headers,” or “Summarize my DMARC reports for the last 30 days.” Domain checks, header analysis, DNS recommendations and email-receipt tests work without signing in. Managing domains and viewing DMARC reports require a MailVakt account. Report collection starts after you publish the provided reporting address in DNS. MailVakt recommends DNS changes for you to review and publish. Email-receipt tests confirm receipt and inspect the message; they do not measure inbox-versus-spam placement at Gmail or Outlook.

Tools

add_domain

Claude

Add a domain to the signed-in user's MailVakt account for DMARC report collection. Takes a domain; returns its DMARC reporting (rua) address and account entry. Repeated calls for the same account and domain return the existing entry. Requires domains:write permission. Does not verify domain ownership, modify DNS, or start receiving reports until the user publishes the reporting address in DNS.

analyze_email_headers

Claude

Analyze raw email headers supplied by the user to investigate authentication or delivery issues. Returns the SPF, DKIM and DMARC results reported in those headers, alignment, the sending IP, whether that IP and the From domain are on free public blocklists (not Spamhaus), and detected issues. It does not independently verify DKIM signatures or establish the receiving provider's exact spam-filter decision. Provide headers only, not the message body.

diagnose_domain

Claude

Audit a domain's SPF, DKIM, DMARC, MX, alignment, BIMI, MTA-STS and TLS-RPT setup and check it against free public blocklists (not Spamhaus) when troubleshooting email authentication or spam delivery. Takes a domain, optional checks and DKIM selectors, and fresh=true to bypass cached results. Returns a graded scorecard, findings, proposed DNS fixes and a public report permalink. Uses DNS and policy-file lookups; never changes DNS or guarantees inbox placement.

generate_dns_records

Claude

Propose email-authentication DNS records and policy files for a domain using its DNS configuration and optional provider names or IDs. Supports baseline (monitoring) or enforce goals; baseline is the default. Returns typed SPF, DKIM, DMARC, MTA-STS and TLS-RPT proposals or provider setup instructions where applicable. Provider-specific values and reporting addresses may need user input. Uses public DNS/policy lookups, possibly cached. Does not publish records or change DNS.

get_dmarc_summary

Claude

Summarize received DMARC aggregate reports for a domain already in the signed-in user's MailVakt account. Takes the domain and a 1-to-90-day window (default 7); returns report and message totals, DMARC pass/fail counts, and per-source SPF/DKIM alignment and receiver actions. Requires domains:read and reports:read permissions. Returns zero totals if no reports were received, or an error if the domain is not in the account. Does not add domains or generate report traffic.

get_inbox_test

Claude

Read a MailVakt email-receipt test using the ID returned by start_inbox_test. Returns pending, received or expired status and, when processed, the received message's authentication, unsubscribe, content and deliverability findings. Reports processing failures as errors. Anyone with the test ID can retrieve it; use only an ID supplied by the user or created in this conversation. Does not measure placement at other mailbox providers.

list_domains

Claude

List domains in the signed-in user's MailVakt account, including each domain's DMARC reporting address. Takes no input and requires domains:read permission. Returns an empty list if the account has no domains. Use to find the account's available domains before requesting DMARC summaries; does not enumerate domains belonging to other users.

start_inbox_test

Claude

Create an email-receipt test in MailVakt. Takes an optional expected sender domain; returns a test ID, unique recipient address and expiry time. The user must send a test message to that address before expiry, then use get_inbox_test to read the result. Creates a new test on each call. Does not send email or measure inbox-versus-spam placement at Gmail, Outlook or other mailbox providers.

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