 | | | Email users | Email users 2004-02-06 - By Paulo Henrique Rodrigues
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The key in sendmail.cf is:
O PrivacyOptions=goaway
if you change this in sendmail.cf people around the world can do the following steps in your mail server:
telnet <your-server > 25
and make
vrfy <name_of_user >
if the server responds
expn <name_of_user >
means that the user exists on the server
;)
Paulo Henrique Rodrigues
e-mail: pauloh@(protected)
Corporate IT Support
Infortron - Assistencia Tecnica e Comercio Ltda
visit us at:
http://www.infortron.com.br/linux
+55 (15) 3237.9200 - Sorocaba/SP/Brasil
-- -- Original Message -- --
From: Rudolf A. A.
To: redhat-list@(protected)
Sent: Friday, February 06, 2004 12:57 PM
Subject: Email users
Hello,
I have a question about sendmail and mail in general.
I want to know is it possible to know if there are some specific users in some specific servers.
for example On mydomain.com I have user myuser@(protected), and people from outside want to know if this user exists or not ?, so how can they do that ?. I mean to know this, without sending email. Otherwise they can send email, and if the mail does not come back, It means the user exists :).
Or without sending email to him, how can I know, is there a such user ivantan@(protected) ?.
Thanks in advance.
Rudolf.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN " >
<HTML > <HEAD >
<META http-equiv=Content-Type content= "text/html; charset=koi8-r " >
<META content= "MSHTML 6.00.2600.0 " name=GENERATOR >
<STYLE > </STYLE >
</HEAD >
<BODY bgColor=#ffffff >
<DIV > <FONT face=Arial size=2 >The key in sendmail.cf is: </FONT > </DIV >
<DIV > <FONT size=2 >
<P >O PrivacyOptions=goaway </P >
<P >if you change this in sendmail.cf people around the world can do the
following steps in your mail server: </P > <FONT size=2 >
<P >telnet <your-server> 25 </P > </FONT >
<P > <FONT face=Arial >and make </FONT > </P > <FONT size=2 >
<P >vrfy <name_of_user> </P >
<P > <FONT face=Arial >if the server responds </FONT > </P >
<P > <FONT face=Arial >expn <name_of_user> </FONT > </P >
<P > <FONT face=Arial >means that the user exists on the server </FONT > </P >
<P > <FONT face=Arial >;) </FONT > </P >
<P > <FONT face=Arial >Paulo Henrique Rodrigues <BR >e-mail: <A
href= "mailto:pauloh@(protected) " >pauloh@(protected) </A > <BR >Corporate
IT Support <BR >Infortron - Assistência Técnica e Comércio Ltda <BR >visit us at: <A
href= "
http://www.infortron.com.br/linux
" >
http://www.infortron.com.br/linux
</A > <BR >+55
(15) 3237.9200 - Sorocaba/SP/Brasil <BR > </FONT > </P >
<P > </FONT > </FONT >-- -- Original Message -- -- </P > </DIV >
<BLOCKQUOTE dir=ltr
style= "PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px " >
<DIV
style= "BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black " > <B >From: </B >
<A title=rudik@(protected) href= "mailto:rudik@(protected) " >Rudolf A. A. </A > </DIV >
<DIV style= "FONT: 10pt arial " > <B >To: </B > <A title=redhat-list@(protected)
href= "mailto:redhat-list@(protected) " >redhat-list@(protected) </A > </DIV >
<DIV style= "FONT: 10pt arial " > <B >Sent: </B > Friday, February 06, 2004 12:57
PM </DIV >
<DIV style= "FONT: 10pt arial " > <B >Subject: </B > Email users </DIV >
<DIV > <BR > </DIV >
<DIV > <FONT face=Arial size=2 >Hello, </FONT > </DIV >
<DIV > <FONT face=Arial size=2 > </FONT > </DIV >
<DIV > <FONT face=Arial size=2 >I have a question about sendmail and mail in
general. </FONT > </DIV >
<DIV > <FONT face=Arial size=2 > </FONT > </DIV >
<DIV > <FONT face=Arial size=2 >I want to know is it possible to know
</FONT > <FONT face=Arial size=2 >if there are some specific users in some
specific servers. </FONT > </DIV >
<DIV > <FONT face=Arial size=2 >for example On mydomain.com I have user <A
href= "mailto:myuser@(protected) " >myuser@(protected) </A >, and people from
outside want to know if this user exists or not ?, so how can they do that
?. I mean to know this, without sending email. Otherwise they can
send email, and if the mail does not come back, It means the
user exists :). </FONT > </DIV >
<DIV > <FONT face=Arial size=2 >Or without sending email to him, how can I know,
is there a such user </FONT > <A
href= "mailto:ivantan@(protected) " >ivantan@(protected) </A > <FONT face=Arial
size=2 > ?. </FONT > </DIV >
<DIV > <FONT face=Arial size=2 > </FONT > </DIV >
<DIV > <FONT face=Arial size=2 >Thanks in advance. </FONT > </DIV >
<DIV > <FONT face=Arial size=2 >Rudolf. </FONT > </DIV >
<DIV > <FONT face=Arial size=2 > </FONT > </DIV > </BLOCKQUOTE > </BODY > </HTML >
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