It is unlikely someone would mark as spam an e-card from somebody they
know. Maybe some company use your service to send spam ?
Make sure users of your service need to create an account(with a
captcha) and set a daily limit for number of e-card sent.

On Dec 23, 5:30 pm, Krystox <krys...@gmail.com> wrote:
> We have a service to let user to send greeting cards to their friends.
> Soon we realize people might mark those emails as spam. As a result,
> the account used to do mail.send() is easily suspended for abuse.
>
> My question is GAE mail quota allows sending thousands of emails per
> day, even the free quota is 2000. How it is possible to not being
> marked as abuse?
>
> Again, we have no intention to spam. Just want to know what is the
> correct way to use this email service. Thank you!

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