sending email with GAE copies sender -- how to stop?

I'm creating an app with GAE to allow people to vote in elections and this involves sending an email to each voter. 开发者_开发技巧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?

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You can't - App Engine automatically BCCs the sender. If you don't want to receive them, you could use one of your app's incoming email addresses as the sender address.

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There is an Issue logged for this problem here:

http://code.google.com/p/googleappengine/issues/detail?id=2059

Please "star" it if you want Google to fix it.