BIMI
See whether a domain publishes a logo that can be shown in the recipient's inbox.
About BIMI
What it is
BIMI (Brand Indicators for Message Identification) is a standard that lets you publish your logo in DNS. Mail clients that support BIMI can then display the logo in the recipient's inbox.
Why it matters
BIMI increases recognition and credibility when your mail is displayed. The standard requires DMARC to be set to quarantine or reject, which means BIMI indirectly drives better security.
Tips
- DMARC must be set to p=quarantine or p=reject, otherwise no one accepts BIMI.
- The logo must be an SVG (specifically the Tiny PS format) published over https.
- A Verified Mark Certificate (VMC) is required by Gmail to display the logo, but not by all clients.
Common questions
Which mail clients display the BIMI logo?
Gmail, Yahoo Mail and Apple Mail support BIMI. Outlook and others are on the way but not fully yet.
Is DMARC and an SVG enough?
For some clients, yes. Gmail additionally requires a Verified Mark Certificate (VMC) from an approved issuer.
More lookups
MX lookup
See which servers receive mail for a domain, and which provider handles it.
SPF check
Check whether a domain has an SPF record and how strictly it rejects spoofed mail.
DMARC check
See whether a domain has DMARC and which policy it uses against spoofed mail.
DKIM check
Look for DKIM signing on a domain using the most common selectors.
DNSSEC check
See whether a domain is protected with DNSSEC, that is, whether its DNS answers are signed.
TXT lookup
List all TXT records for a domain, including SPF, verifications and more.
NS lookup
See which name servers control a domain's DNS.
Blacklist check
Check whether a domain's IP address is on blacklists such as Spamhaus, Barracuda and SpamCop.
A/AAAA lookup
See which IP addresses a domain points to, both IPv4 (A) and IPv6 (AAAA).
CNAME lookup
See whether a domain is an alias that points on to another domain.
SOA lookup
See the zone's core data: primary name server, contact and serial number.
CAA lookup
See which certificate authorities are allowed to issue certificates for the domain.
Reverse DNS (PTR)
Look up which host name a domain's IP address points back to.
MTA-STS
See whether a domain requires encrypted mail delivery via MTA-STS.
TLS-RPT
See whether a domain receives reports about failed encrypted mail delivery.
SSL certificate
Check a domain's TLS certificate: issuer, validity and expiry.
Whois
See who owns a domain, when it was registered and when it expires.
HTTP security headers
Check whether a domain's website sets important security headers.