Hm... I have to look up how to get PHP to send via SMTP, but that's a reasonable idea. I got some links from some people, and I signed up for a transactional email service, which should be better I hope, though the free account has 30k free emails a month, which we hit easily (I'd estimate we have over 100k emails a month, and it's only going to go up? Most services I've seen charge about $70 a month for 100k emails, and that's not sustainable for a free site). Given this isn't marketing, but updating, the only cost effective method will be to send emails myself, but for that I need to figure out how to best keep GP's emails from being spammed.