I'm working on a qpsmtpd/Dovecot programming task to expand my knowledge. I want to deliver mail using Dovecot's LDA. The shell command that works looks like this: 
/usr/lib/dovecot/deliver -f test@somedomain.com -d test@mailtask.dom <
+ demo.mail

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Order is important. The email file goes on the end. Question 1: What are other more convoluted ways of writing that command? I tried to pipe and it just didn't work. It should be obvious my STDIN-foo is weak. So... very... weak... My test code that doesn't work looks like this: 
use strict;

open FH, "< ./demo.mail";
my @all = <FH>;
close FH;

my $stringified = '';
foreach (@all) {
  $stringified .= $_;
  }

#print $stringified;

close STDOUT;
my $test = open (STDOUT, ' $stringified | /usr/lib/dovecot/deliver -f 
+test\@somedomain.com -d test\@mailtask.dom ');
print $test;

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Question 2: how do I write the open line to work like the command line version?

In reply to Newbie: Pipe/STDIN Clarification by mpapet

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