We do not have any records of a conflict with this plugin. It looks like a WP Mail issue. Have you activated the wysija plugin with no other plugins activated? Does it still bring up an error?
Maybe try turning on wp debug or installing the wp debug bar plugin so you can what other errors are being created. You should also try looking at the error logs to see what unseen errors are happening. That will help both plugin developers get a better idea of what is happening.
Also, have you reported this to wysija.com as well? Because I am thinking it might be something wrong with your wysija.com settings or something. Event Espresso uses the wp mail function, so if that plugin is overriding that function, it could be a conflict somewhere.
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