Thanks for this upgrade but it does'nt fix all.
I'm using 2 other plugins that are able to send mails. One is mine and send emails as webmaster. The new release fix the problem because I confured the webmaster email as sender.
THe other plugin is contact form 7 : we have some contact forms on our site in order to send emails to our staff.
My use case is : the site user want to contact our secretary. In the form, we ask for his email, name, adress.. and some other things. In order to avoid spams and facilitate the answer we put the user email as the sender of the email. Like this we receive an email from the user and we just have to reply to him other email. With your plugin activated, these contacts emails are broken because they are all set with the wordpress email parameter and not the user email.
So the trick is to force the sender as wpsc email sender only for wpsc emails and to keep it unchanged for others, because in this case the sender is configured by wp or other plugins.
I've another issue, regarding PDF. I have a lot of errors when dompdf try to build the PDF. Something is misssing ? any php config ?
I think that it will be good to have the possibility to validate or not the use of the PDF even if we bought it. Somthing like check box "send pdf as attached".
Hope it helps