[MacPorts] #67614: OpenSMTPD 7.3.0p0 rc2 preliminary Portfile

[MacPorts]

#67614: OpenSMTPD 7.3.0p0 rc2 preliminary Portfile
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  Reporter:  artkiver   |      Owner:  ryanakca
      Type:  update     |     Status:  assigned
  Priority:  Low        |  Milestone:
 Component:  ports      |    Version:  2.8.1
Resolution:             |   Keywords:
      Port:  OpenSMTPD  |
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Comment (by artkiver):

 7.3.0p0 was officially released on 2023-06-17 (June 17th, 2023).

 Using this previous effort as a basis, I spruced up the Portfile (omitting
 the GitHub related PortGroup changes as an official tarball is now
 available on opensmtpd.org) and submitted a PR here:

 https://github.com/macports/macports-ports/pull/19180

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Ticket URL: <https://trac.macports.org/ticket/67614#comment:5>
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