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good wishes to all the member from a novice;I use winxp and can connect to yahoo email smtp server through outlook express /thunderbird without any problem. But when I try to connect through telnet> yahoo.co.in 25 , I get the error message 421 cnanot connect to server 68..connect error 10060.However when I connect vis command o smtp.mail.yahoo.com 25 I get deamon banner 220 and when i enter any further command like mail to: , I get the error mesage 530 authentication required:for help go to help.yahoo.com.Having visited the help site I donot find anything wrong either with windows or telnet or firewall or virus softwae which I have tried even after disabling them. how should I proceed further.will any one please guide and help me to solve it thanks
 

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Is there any particular reason why you want to use telnet? This is an old, insecure protocol which should no longer be used except for some very limited purposes. Quote from Wikipedia;

"Experts in computer security, such as SANS Institute, and the members of the comp.os.linux.security newsgroup recommend that the use of Telnet for remote logins should be discontinued under all normal circumstances, for the following reasons:
*Telnet, by default, does not encrypt any data sent over the connection (including passwords), and so it is often practical to eavesdrop on the communications and use the password later for malicious purposes; anybody who has access to a router, switch, hub or gateway located on the network between the two hosts where Telnet is being used can intercept the packets passing by and obtain login and password information (and whatever else is typed) with any of several common utilities like tcpdump and Wireshark.
*Most implementations of Telnet have no authentication to ensure that communication is carried out between the two desired hosts and not intercepted in the middle.
*Commonly used Telnet daemons have several vulnerabilities discovered over the years"
 

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Yahoo does not allow telnet, you have to authenticate, and in fact you have to connect twice on the basis that if you have real email to deliver you will try again, if its SPAM you won't
 
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