From: Brian Candler <b.candler@...>
Date: 2011-11-03T06:58:56+09:00
Subject: Re: Ruby and Telnet

Leo M. wrote in post #1029741:
> Because I want to perform a smtp reverse lookup!

And what do you mean by "a smtp reverse lookup"??

If you want to talk SMTP directly, then you first need to read and fully 
understand RFC 2821.

Then use TCPSocket.new('smtp.example.com',25) and use the socket 
directly.

There are lots of pitfalls - e.g. remember to send \r\n at the end of 
each line, instead of \n, to be properly compatible.

As someone else said: just use Net::SMTP where all this has been taken 
care of.

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