My application sends email on behalf of users who are always logged in
via their Google Accounts. All emails get sent using the logged in
user's email address in the "From" field. This is working fine.

I have these crucial open questions around spam and best practices.

1. If a rogue user sends out spam email, will it have an adverse
effect on my application? Or will it only ding the spammer's email
address(it being marked as spam)? By adverse effect on my application,
I mean "Will emails from other good users be also considered as spam"
since they are all being sent from the same application.

2. If a logged-in user wants to send out bulk email, should it be sent
using their Google account or should it be sent via an admin account
(what is the best practice?).

3. Assuming that a logged-in user ([email protected]) sends out 1000
emails, and my application sends them on behalf of the user, will the
gmail restriction on sending emails kick in?
http://mail.google.com/support/bin/answer.py?hl=en&answer=22839

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