I used a poor choice of words. Blocking isn't right. What I meant to say was that once I start reading from the socket (one line at a time) I can't write to it and have it received. I have switched back to the Client2 code. The offending portion is in get_message(). If I run with the following code: 

# sub process {
sub get_message {
    my $self = shift;
    my($cmd, @args);
    
    my $sock = $self->{SOCK};
    $self->_reset0;
    
    print $sock "STUFF1\r\n";
    while(<$sock>) {
    print $sock "STUFF2\r\n";
    print "$$ command: $_";
... rest of routine

[download]

The output (from the perspective of the client is:

Net::SMTP>>> Net::SMTP(2.31)
Net::SMTP>>>   Net::Cmd(2.29)
Net::SMTP>>>     Exporter(5.60)
Net::SMTP>>>   IO::Socket::INET(1.31)
Net::SMTP>>>     IO::Socket(1.30)
Net::SMTP>>>       IO::Handle(1.27)
Net::SMTP=GLOB(0x20f758c)<<< 220 Debatable SMTP 0.2 Ready.
Net::SMTP=GLOB(0x20f758c)>>> EHLO localhost.localdomain
Net::SMTP=GLOB(0x20f758c)<<< STUFF1

[download]

In other words it only writes to the client the first time (it never sends STUFF2 to the client). Once the socket is read from writes aren't happening in other words. It is perplexing.

In reply to Re^4: Using Threads For Simple SMTP Relay Server by lamberms
in thread Using Threads For Simple SMTP Relay Server by lamberms

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