Postcheck: Email Auth Monitor
Not claimedPostcheck watches your domains' email authentication from the menu bar and tells you, in…
By Dakabi LLC · UtilitiesWhy we expect it: Clear value and thorough checks for email authentication, with exact DNS fixes that save admins real troubleshooting time.
About
Postcheck watches your domains' email authentication from the menu bar and tells you, in plain English, what is wrong and the exact DNS record that fixes it.
CHECKS • MX: records resolve, no dangling hosts, STARTTLS on port 25 • SPF: syntax, the 10-lookup limit, void lookups, +all/?all, includes followed all the way down • DKIM: keys found and decoded for your selectors and the common ones (Google, Microsoft 365, iCloud, Fastmail, Zoho, Mailchimp, Zendesk, Proton), key strength, CNAME'd selectors • DMARC: policy, pct, subdomain policy, report addresses and whether outside report addresses are authorised • MTA-STS, TLS-RPT and BIMI presence and validity • Blocklists: your mail server and SPF addresses on Spamhaus, SpamCop, Barracuda and SORBS
GRADE AND FIX Every domain gets an A–F grade. Every finding comes with the host, type and value to publish. The SPF flattener rewrites over-limit records and reminds you when provider addresses drift. Provider wizards list the records Google Workspace, Microsoft 365, HubSpot, Mailchimp, SendGrid, QuickBooks and Zendesk need and compare them with live DNS.
MONITOR Postcheck re-checks every six hours, shows the worst domain state in the menu bar, notifies you when a record changes or a grade drops, and keeps a timeline of every change.
DMARC REPORTS Read aggregate reports from any IMAP mailbox (including Gmail with your own OAuth client), drop report files onto the window, or watch a folder. See who sends as your domain, pass rates, alignment and a daily trend, and get a straight answer to “is it safe to move to quarantine or reject?” with the unaligned legitimate senders listed.
REPORT Export a PDF or Markdown report per domain, or one branded PDF covering all of a client's domains.
FREE AND PRO Free: one domain, manual checks, the grade and every fix. Postcheck Pro (one-time purchase): unlimited domains, automatic re-checks, alerts, timeline, DMARC reports, blocklists and exports.
PRIVACY DNS lookups use DNS-over-HTTPS. Mailbox passwords and tokens stay in your Keychain. Nothing is sent to the developer; there is no account and no analytics.
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