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I'm making a smtp server using postfix,now I can send mail successfully by sendmail command,

but failed send mail via smtp,my test program always block at the readline(read reply of server via tcp) part.

I tried to use the 

telnet myhostname 25

and the server sent status0,then no any reply.

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  • Then you do not connect to a Postfix server. It must be something else like a firewall or transparent proxy.
    – mailq
    Apr 3, 2012 at 15:59
  • I fixed this problem by add smtp inet n - n - - smtpd to master.cf,sorry for my careless
    – peon
    Apr 4, 2012 at 3:10
  • Could be a problem in master.cf (smtp pointing to an invalid command - ry pointing it to smtpd).
    – Paul S
    Nov 27, 2016 at 20:47

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When connecting, run a tail -f on your maillog file. It will show the connection being made and then any errors. There are many ways email can be blocked or dropped, and the error in the log will indicate exactly why.

You may have failed one of your postfix config requirements, or if postscreen is being used, it may be dropping the connection for acting like a spammer's tool.

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  • Nothing in the log file when i connecting.when I closing the connection it shown Apr 4 10:05:46 (none) postfix/smtp[16756]: warning: unexpected end-of-input from smtp socket while reading input attribute name Apr 4 10:05:46 (none) postfix/smtp[16756]: warning: deliver_request_get: error receiving common attributes
    – peon
    Apr 4, 2012 at 2:07

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