This App takes a mail server (e.g. mail.google.com) and quickly shows all other domains that use the same mail server. Useful for identifying domains that are used as email aliases.

This test will list MX records for a domain in priority order. The MX lookup is done directly against the domain's authoritative name server, so changes to MX Records should show up instantly. You can click Diagnostics , which will connect to the mail server, verify reverse DNS records, perform a simple Open Relay check and measure response time performance. You may also check each MX record (IP Address) against 105 DNS based blacklists . (Commonly called RBLs, DNSBLs)

Each lookup reveals the number of MX records related to the mail server of interest and provides a list of all the domains connected to it, along with details on when their MX records were last updated.

Our reverse MX lookup tool has access to a comprehensive database that contains information on close to 1.5 billion domains and subdomains and 150 million MX records updated daily.

Sharing a mail server with a malicious domain can be detrimental to your organization’s reputation and can very well cause your domain’s inclusion in a blacklist. Use Reverse MX Lookup to get a list of all your mail server co-occupants so you can do thorough background checks on them. Make sure none of them are known spammers, phishers, or malware hosts.

As you likely know, DomainTools has taken many steps over the years to add ever more data points and functionality to the Iris investigation platform. A component of the Iris dataset frequently used by investigators is MX data. The comprehensive and freshly-updated MX data in the Iris database, as well as Iris's superior data gathering and updating technology, have made the classic Reverse MX redundant, so we have retired it.

You can easily search by MX records directly from the search box at the top of Iris, and can also pivot on MX data to find related infrastructure, simply by scrolling to the mail server data types for each domain in the Pivot Engine.