Changes with nginx 1.6.1 05 Aug 2014
*) Security: pipelined commands were not discarded after STARTTLS command in SMTP proxy (CVE-2014-3556); the bug had appeared in 1.5.6. Thanks to Chris Boulton.
*) Bugfix: the $uri variable might contain garbage when returning errors with code 400. Thanks to Sergey Bobrov.
*) Bugfix: in the "none" parameter in the "smtp_auth" directive; the bug had appeared in 1.5.6. Thanks to Svyatoslav Nikolsky.