MxToolbox alternative: how FaultyPacket checks DNS and DMARC in your browser
Last reviewed 31 October 2026
People looking for an alternative to MxToolbox often want quick answers about a domain's DNS and mail records. This page gives a short, factual description of MxToolbox, taken from its own public pages, and then explains how FaultyPacket works, so you can choose what suits you.
What MxToolbox is
MxToolbox is a set of web-based MX, mail-server and blacklist lookup tools, according to its own website.Source: mxtoolbox.com, checked 31 October 2026.
- Its MX Lookup lists a domain's MX records in priority order, queried directly against the domain's authoritative name server.Source: mxtoolbox.com, checked 31 October 2026.
- The same page offers Diagnostics, which connect to the mail server, and a check of each MX address against DNS-based blacklists (RBLs or DNSBLs).Source: mxtoolbox.com, checked 31 October 2026.
How FaultyPacket works
This section describes FaultyPacket's own approach. It is not a description of MxToolbox.
Scans run in your browser
The free scanner looks up your DNS records through public DNS-over-HTTPS resolvers, straight from your browser. There is no sign-up.
No scan data held
FaultyPacket does not log or store the domains you scan (see our privacy notice). Optional scan history stays in your own browser.
One-off packs
Fix scripts, policies and server configs come as one-off downloadable packs, sold individually, with no account to create.
Local RUA Workbench
The Local RUA Workbench reads DMARC aggregate reports on your own machine: one offline HTML file and a Python tool. Nothing is uploaded.
For a quick look at one domain, the free scanner reads MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT and BIMI records in one pass and suggests the next fix for each finding.
About this page
MxToolbox and the other product names on this page are trade marks of their respective owners. FaultyPacket is not affiliated with, endorsed by or sponsored by any of them. The description of MxToolbox uses solely the public pages linked above, as they read on the date shown, and makes no claim about how well any product works.
Right of reply: if anything here is out of date or inaccurate, email [email protected] and we will review and correct it. These pages are re-checked against their sources twice a day and reviewed in full every 90 days.
Other factual notes: dmarcian alternative EasyDMARC alternative Valimail alternative PowerDMARC alternative