Google Admin Toolbox CheckMX
Google Admin Toolbox Check MX for inbound mail DNS sanity checks.
- Reading time:
- 5 min
- Difficulty:
- Intermediate
- Estimated duration:
- 5 min
- Prerequisites:
- None
- Last updated:
- 2026-07-15
- Author:
- empire
Overview
Google Admin Toolbox Check MX for inbound mail DNS sanity checks.
Vendor: Google
Primary purpose
Validate MX and related inbound DNS configuration quickly.
Best for
- Checking inbound MX readiness for Google Workspace domains
Common use cases
- Verify MX after a cutover
- Catch missing address records for MX hosts
Advantages
- Focused MX checklist
- Browser-based
Limitations
- Oriented toward Google’s inbound expectations
When not to use it
- You only need outbound authentication inspection
Pricing
Free web utility.
Official website
Inputs and outputs
Typical inputs
- Domain
Typical outputs
- MX and related DNS findings
Privacy notes
- Review each vendor’s data handling before uploading production lists or message content.
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Related Solve Articles
- CNAME at zone apexA CNAME is placed at the zone apex where other record types are also required.
- HELO / EHLO problemsThe SMTP HELO/EHLO hostname is missing, invalid, or inconsistent with reverse DNS.
- Inconsistent authoritative answersAuthoritative name servers for the same zone return conflicting data.
- Incorrect MX targetMX points to the wrong host name or unreachable mail server.
- Missing glue recordsDelegation references in-bailiwick name servers without required glue.
- MX record missingNo MX record is published for a domain that should receive mail.
- NXDOMAIN for expected nameA name that should exist returns NXDOMAIN from authoritative servers.
- Reverse DNS mismatchPTR (reverse DNS) for a sending IP is missing or does not match the forward hostname used in mail.
- Stale DNS cache after changeResolvers still serve prior answers after an authoritative change because TTL has not expired.
- Wrong TTL for cutoverTTL values are too high for a planned cutover, prolonging mixed old/new answers.