From: Brian Candler <b.candler@...>
Date: 2008-12-17T20:10:28+09:00
Subject: Re: Finding out in-memory size of an email

Petr Janda wrote:
> I have a script that executes sendmail binary like this
> 
> exec '/usr/sbin/sendmail'
> 
> This opens op the sendmail STDIN that waits for the email to be typed or
> inputed via other means(postfix). Is it at all possible to actually
> find out the size of the email(in bytes) thats going into sendmail?

Not sure how this relates to Ruby.

If your ruby script is using 'exec' like that, then it is *replacing* 
the entire Ruby interpreter with sendmail. At that point, sendmail is 
running, accepting data on stdin, and Ruby has terminated. So sendmail 
knows the size of the E-mail, but there is no-one to tell.

Perhaps what you want is to keep Ruby running while sending data to 
sendmail, e.g. (untested)

  count = 0
  IO.popen("/usr/sbin/sendmail","w") do |sendmail|
    while data = $stdin.read(4096)
      sendmail << data
      count += data.size
    end
  end
  STDERR.puts "Thank you. You sent #{count} bytes."
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