Missing server response text in Net::SMTPFatalError

[papeng]

I noticed that Net::SMTPFatalError exceptions do not contain the full server response error lines.

To test if a SMTP server is rejecting SPF failing messages, I created the following debug snippet with net/smtp:

require 'net/smtp'

smtp = Net::SMTP.new('[REDACTED]', 25)
smtp.set_debug_output STDERR

error_msg = nil

smtp.start() do |smtp_connection|
  begin
    smtp_connection.send_message '', '[email protected]', '[REDACTED]'
  rescue Net::SMTPFatalError => e
    error_msg = e
  end
end

STDERR.puts error_msg

This shows the following SMTP transaction, when the mail is rejected. Notice the two lines containing the SMTP 550 error response.

[...]
<- "MAIL FROM:<[email protected]>\r\n"
-> "550-SPF-check failed:\r\n"
-> "550 example.com does not allow sending mails from [REDACTED]\r\n"
<- "QUIT\r\n"
-> "221 [REDACTED] closing connection\r\n"

But STDERR.puts error_msg only prints the first error line:

550-SPF-check failed:

[tmtm]

After #26, you will be abel to:

rescue Net::SMTPFatalError => e
  error_msg = e.response.string
end