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I'm not sure what you think you're going to accomplish by sending a MAIL FROM: before the connect banner arrives. Before sending a MAIL FROM, you generally need to:
I suppose if you're testing a filtering product, sending MAIL FROM immediately does make sense. In that case you probably want to throw as much test data, both RFC-conformant and non-conformant, as you can think of. The place for you to start looking is IO::Socket::INET. Once you've generated your socket, do something like $sock->send("MAIL FROM:<spammer@somedomain.tld>"), and call $sock->recv to get your result. You might also want to look at the guts of Net::SMTP to get some ideas. In reply to Re: opening a telnet/smtp connection without waiting for response
by dave0
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