As many incur, my hosting does have a 500 emails an hour limit, and with a 3,000 count list, I must have a throttling solution. Currently, I am at wits end trying to throttle emails from Subscribe2 8.7 through Mailer 1.1.0 by Stefano Lissa, which does not work no matter what setting tried, via wp_mail() or SMTP. Yes, I tried to purchase WordPress Mail Queue (WPMQ) 2.0 previously, but the purchase function is disabled at: http://wpplugins.com/purchase/76/wordpress-mail-queue-wpmq/. I read on some places that the PHP constructs within WPMQ 2.0 is triggering maleware reports? Therefore assume that is why it was disabled.
I did install WP Mail Log 0.2 by MacDonald that confirms that the emails are being generated, albeit not making into the Mailer 1.1.0 queue, rather using wp_mail() or SMTP.
Whatever the case, is there a working solution within this planetary system for controlling abbreviated text only outbound emails to Public Subscribers? I would be happy to share the blog login credentials via direct email if possible, for personal examination. A fix would also be worthy of some payment.