[Plugin: email users] Users not receiving sent e-mail

Hello,

I’ve been having problems this week using the e-mail users functionality. We are using an older version of e-mail users, but it has performed flawlessly until recently. We are getting an ok that the e-mail has sent but it is not showing up in our inboxes. We use an e-mail list at my school to communicate and have it set up to send to this list.

Any ideas?