:(
Don't suppose you guys would consider integrating something like phpmailer in the future? When using shared hosting and sending out a larger amount of e-mails, it really drags down the servers, which is why my hosting company has me on a dedicated mail server. I service 50+ clients with that and all of them having mailing lists. I was considering switching to your mailing product (and therefore purchasing Power Messenger for current and future clients), but without the ability to use SMTP authentication, that puts it out of the running. I think this will seriously limit your product use in the future.
Off to reluctanctly submit a refund request ...