[MacPorts] #55862: Portfile for smtpping

[MacPorts]

#55862: Portfile for smtpping
---------------------------+------------------------
  Reporter:  juergennagel  |      Owner:  ryandesign
      Type:  submission    |     Status:  accepted
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  smtpping      |
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Comment (by ryandesign):

 And changed `license` from `GPL-2` to `GPL-2+` because the source code
 files say:

 > This program is free software; you can redistribute it and/or
 > modify it under the terms of the GNU General Public License
 > as published by the Free Software Foundation; either version 2
 > of the License, or (at your option) any later version.

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Ticket URL: <https://trac.macports.org/ticket/55862#comment:2>
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