It looks like ActiveState perl strikes again.

That strange, because I'm using ActiveState Perl also.

I guess it is blocking.

Sockets are blocking by default and nothing in the code you posted attempts to set them as non-blocking.

Before I start reading from the IO::Socket in the Client3 I can write to it. Once I start reading from it in Client3::get_message() what I write to the socket is never sent to the other side of the socket.

You cannot simultaneously read and write to a blocking socket. It's like using a walky-talky. There is no point in talking whilst the person on the other end is transmiting, because they will not hear you.

But I don't see the need for a non-blocking socket for implementing the SMTP protocol?

It is a command-response protocol. Your client3 code should work in the same way as the Client2 code. Wait for a command, and once you get one, make no more reads until it has finshed sending the complete response to that command.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
"Too many [] have been sedated by an oppressive environment of political correctness and risk aversion."

In reply to Re^3: Using Threads For Simple SMTP Relay Server by BrowserUk
in thread Using Threads For Simple SMTP Relay Server by lamberms

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