google app engine - sending email with GAE copies sender -- how to stop?

Question

I'm creating an app with GAE to allow people to vote in elections and this involves sending an email to each voter. I do this in a loop:

mail.send_mail(sender = manager.email(),
               to = email,
               subject = election.title,
               body = body)

where manager is the signed-in user.

This appears to BCC the manager on all emails, but I don't want that to happen. Is there a way to send the email only to the intended recipient?

Answer 1

Waitting for answers