[NANOHUB][#272593][PLG_CRON_NEWSLETTER] Adding extra check to try and prevent duplicate mailings
[NANOHUB][#272593][PLG_CRON_NEWSLETTER] Adding extra check to try and prevent duplicate mailings

zweidner/hubzero-cms,zweidner/hubzero-cms,zweidner/hubzero-cms,zooley/hubzero-cms,anthonyfuentes/hubzero-cms,zooley/hubzero-cms,anthonyfuentes/hubzero-cms,anthonyfuentes/hubzero-cms,zooley/hubzero-cms,zooley/hubzero-cms,anthonyfuentes/hubzero-cms,zweidner/hubzero-cms