Log Message:
Update to 2.6.3. From the changelog:

  Fixed a serious bug where spamdyke was closing the connection to qmail and
    exiting as soon as the remote host exited.  When the remote host sends its
    SMTP data in one burst and closes the connection without waiting for the
    response code from the DATA segment, qmail doesn't accept the message and
    nothing gets delivered.
  Added some code to log_writeln() to translate bare carriage returns into
    carriage return/linefeed combinations.  This allows poorly written remote
    servers to send mail, most notably Microsoft web servers.  Dogmatically
    refusing to accept mail by refusing to be more flexible than RFC 822
    will never change the world; let's be reasonable instead of bouncing
    messages back to our friends who can't change their mail servers anyway.
  Fixed smtp_filter() to accept parameters to AUTH LOGIN when the MUA sends the
    authentication information with the command instead of waiting for the
    prompts.  Thanks to Carlo Blohm for reporting this one.