- update default configuration to enable the long-term fix for
  bsc#1218304, bsc#1218314 CVE-2023-51764, SMTP smuggling attack:
  * smtpd_forbid_bare_newline = yes
  * smtpd_forbid_bare_newline_exclusions = $mynetworks

- update to 3.8.4
  * Security: this release adds support to defend
    against an email spoofing attack (SMTP smuggling) on
    recipients at a Postfix server. For background, see
    https://www.postfix.org/smtp-smuggling.html.

- update to 3.8.3
  * Bugfix (defect introduced Postfix 2.5, date 20080104): the
    Postfix SMTP server was waiting for a client command instead
    of replying immediately, after a client certificate verification
    error in TLS wrappermode. Reported by Andreas Kinzler.
  * Usability: the Postfix SMTP server (finally) attempts to log
    the SASL username after authentication failure. In Postfix
    logging, this appends ", sasl_username=xxx" after the reason
    for SASL authentication failure. The logging replaces an
    unavailable reason with "(reason unavailable)", and replaces
    an unavailable sasl_username with "(unavailable)". Based on
    code by Jozsef Kadlecsik.
  * Compatibility bugfix (defect introduced: Postfix 2.11, date
    20130405): in forward_path, the expression ${recipient_delimiter}
    would expand to an empty string when a recipient address had
    no recipient delimiter. The compatibility fix is to use a
    configured recipient delimiter value instead. Reported by Tod
    A. Sandman.

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