[CentOS] Sending Email Via Telnet

Giles Coochey giles at coochey.net
Wed Oct 17 04:47:42 EDT 2012


On 16/10/2012 16:16, John Reddy wrote:
>
>> Something isn't quite right with your setup.  When you do the "HELO" command, the server should reply with something.  For example:
>>
>> ==
>> $ telnet smtp.comcast.net 25
>> Trying 76.96.40.155...
>> Connected to smtp.comcast.net.
>> Escape character is '^]'.
>> 220 omta12.emeryville.ca.mail.comcast.net comcast ESMTP server ready
>> HELO comcast.net
>> 250 omta12.emeryville.ca.mail.comcast.net hello [69.24.1.7], pleased to meet you
>> ==
>>
>> Does the mail server ever return anything back to you?
>
Sometimes, if you are traversing a firewall between you and the mail 
server the firewall blocks the connection because telnet uses the tcp 
PUSH flag.

-- 
Regards,

Giles Coochey, CCNA, CCNAS
NetSecSpec Ltd
+44 (0) 7983 877438
http://www.coochey.net
http://www.netsecspec.co.uk
giles at coochey.net




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