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MX, SPF, DKIM and DMARC. If any of these is missing, anyone can send email in your name, and yours may end up in spam.
Example: tusitio.pe or https://www.tusitio.pe. Takes a few seconds.
Very often. Without SPF and DKIM, receivers cannot verify that the email really comes from you, and DMARC tells them what to do when it does not.
The standard stops evaluating SPF after 10 DNS lookups. Records with many "include" mechanisms exceed it and stop working silently.
DKIM keys live under a selector name that cannot be enumerated. We try the usual ones; a custom selector is fine, just not visible here.
Everything at once, with a grade from A to F.
See every DNS record of a domain: A, AAAA, CNAME, NS, MX, TXT, SOA and CAA, as our resolve...
Registrar, creation and expiry dates, nameservers and transfer lock of any domain. The exp...
Is the certificate valid, who issued it, when does it expire and which TLS versions does t...
IP address, country, network and the hosting provider we deduce from it. Also whether the...
HSTS, Content-Security-Policy, X-Frame-Options and the rest: the headers that protect your...
Where does a URL end up, and through how many hops. Redirect chains slow every visit down...
Meta robots, X-Robots-Tag header and robots.txt. Launching a site with a "noindex" left ov...
We request the site right now from our server and tell you the status code and the respons...