Merge branch 'ja/send-email-ehlo'

* ja/send-email-ehlo:
  git-send-email.perl - try to give real name of the calling host to HELO/EHLO
  git-send-email.perl: add option --smtp-debug
  git-send-email.perl: improve error message in send_message()

diff --cc git-send-email.perl
Simple merge