Upload the plugin files to the wp-content plugins directory, or install the plugin through WordPress plugins screen directly..
When you want to use WP Mailster you don't need to browse to website, login and do something to send the message there you just use your favorite mail client..
So use Gmail, Outlook, Thunderbird, Webmailer, any way you like just send it to the list address you have setup WP Mailster...
The send errors are messages your server is giving back to WP Mailster saying.
The developer is responsive, both in making updates and adjustments when it's called for, and in explaining the technical limitations when particular feature just isn't possible..
I wrote couple code snippets to integrate the listserv with our membership plugin.
WP Mailster, on the other hand, handled CSV imports and exports, had great, well-organized interface, and handled cron-jobs invisibly through their included service.
I've used Joomla of Mailster for many years now and seeing it ported across to WordPress was great news for me as of the 100+ sites I manage, all but one were WordPress and that one was Joomla only because I needed it for Mailster..
it's relatively new WordPress plugin, the concept behind the scenes is sound and well tested so I was happy to become adopter.
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
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