Log Message:
mail/opensmtpd: update to 7.6.0p1

# changes (since 7.5.0p0)

* added missing forward(5) documentation fix
* Introduced a new K_AUTH service to allow offloading the credentials to a
  proc table for non-crypt(3) authentication. Helps with use cases like
  LDAP or custom auth.
* Implement report responses for proc-filters too.
* Changed the table protocol to a simpler text-based one. Existing proc
  tables needs to be updated since old ones won't work. The new protocol
  is documented in smtpd-tables(7).
* Fixed the parsing of IPv6 addresses in file-backed table(5).
* Document expected MDA behavior and the environment set by OpenSMTPD.
* Set ORIGINAL_RECIPIENT in the environment of MDA scripts for
* Updated the bundled libtls.