Changes with nginx 0.5.15 19 Mar 2007

    *) Feature: the mail proxy supports authenticated SMTP proxying and the
       "smtp_auth", "smtp_capablities", and "xclient" directives.
       Thanks to Anton Yuzhaninov and Maxim Dounin.

    *) Change: the "imap" and "auth" directives were renamed to the "mail"
       and "pop3_auth" directives.

    *) Bugfix: a segmentation fault occurred in worker process if the
       CRAM-MD5 authentication method was used and the APOP method was
       disabled.

    *) Bugfix: if the "starttls only" directive was used in POP3 protocol,
       then nginx allowed authentication without switching to the SSL mode.

    *) Bugfix: worker processes did not exit after reconfiguration and did
       not rotate logs if the eventport method was used.

    *) Bugfix: a worker process may got caught in an endless loop, if the
       "ip_hash" directive was used.

    *) Bugfix: now nginx does not log some alerts if eventport or /dev/poll
       methods are used.