Itu adalah command yang ada di SMTP server.
Coba saja install SMTP Server di PC local atau kalau iseng telnet SMTP server 
ISP.
Mis ketik di DOS Prompt: Telnet <ip-smtp-server> 25
Nah lalu ketik help :-)
Atau ketik keyword tsb: SMTP COMMAND MAIL EXPN VRFY ETRN di google.co.id
Good luck in googling.

Regards,

Stephanus J Alex Taidri
Instructor, BIT Education - Cisco Training Center
http://edu.bitgroups.com


-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 
Sent: Sunday, June 12, 2005 12:23 AM
To: itcenter@yahoogroups.com
Subject: [ITCENTER] MAIL/EXPN/VRFY/ETRN ???

Ada yang tahu ttg hal ini :
 MAIL/EXPN/VRFY/ETRN ???

Artinya apa yach ???

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