I saw this page:

http://www.offensive-security.com/me...SMTP_SMTP_Enum

but when i used this I found an error. This is my command on msfconsole:

Code:
use use auxiliary/scanner/smtp/smtp_enum
show options
set RHOSTS 192.168.1.20
run
And this is the output:

Code:
[*] Error: 192.168.1.20: TypeError can't convert nil into String[*] Scanned 1 of 1 hosts (100% complete)[*] Auxiliary module execution completed
Where am I wrong? Thank u for helps...