Developed a site on a localhost via MAMP.
Deployed site to hosting server.
Postie failed to make connection with mail server.
Confirmed all settings configured as required by Postie AND web host.
Attempted a series of configuration options to no avail.
Disabled and then deleted the plugin. Reinstalled the plug in, double checked the connections, wonder of wonders it works!
Strange behavior (we dug into the database to confirm the settings were correct prior to deleting the plugin), not sure if the initial install of the plugin on a local server (my MacBook) created and odd situation when propagating the site to live server...