Thanks for the great plugin. I'm using it as part of bitnami hosting on Amazon and it saves a lot of hassle.
I'm actually having the same problem as the guys above. I've had a look at the link and your advice, but, and I maybe being daft here, where is the Additional Headers field? I'm not using contact form 7, so this will be used for admin email and probably gravity forms, but for things like passwords I would still like it to send from the from email address.