Security for everyone

EXPN Mail Server Detection Scanner

You can detect mail server using this tool.


Short Info




Single Scan

Can be used by


Estimated Time

5 sec

Scan only one

Domain, Ipv4

Parent Category

EXPN Mail Server Detection Scanner Detail

The SMTP "EXPN" command allows you to expand a mailing list or alias, to see where mail addressed to the alias actually goes. For example, many organizations alias postmaster to root, so that mail addressed to postmaster will get delivered to the system administrator.

An attacker might use the disclosed information to harvest specific security vulnerabilities for the application identified.

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