[jemiller226]

Looks like that's the case. I'm on Gmail and it works fine, and it works for others on Gmail, but users who are on Hotmail and Yahoo can't receive the email. Knowing this helps, but at the same time it doesn't. I'm an experienced IT guy, but I do next to nothing with mail servers.

I've found instructions on how to get removed from Hotmail and Yahoo blacklists, but they're asking for information I'm not sure I have access to. Where would the outgoing mail logs be for the PHP mail system that VB uses?

EDIT: Might it be because the email address we use for the password reset message comes from an @gmail.com address when the actual server is @fasthosts.net.uk? Even Gmail pops up a phishing warning. Hotmail and Yahoo might just be blocking it outright. I'm not sure that's something that can be helped, though, because Fasthosts is the host, but the email address would still be @somethingelse.co.uk, and it would likely trigger the same filters.