More efficient to store email addresses or query facebook for email when sending bulk emails -

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i have facebook application communicate directly users via email. better idea store user's email addresses when authenticate application , send email ever user in database

or

should store fbid , execute query each user @ time of sending emails latest possible email address facebook? slower, if i'm sending out 10,000 emails, give me latest email addresses in event user has changed theirs.

which 1 best?

i best store users email address locally , subscribe facebook real time updates when user updates email address.

i warn you run risk of having facebook app removed due spam if sending unsolicited non-opt-in marketing emails (spam) users , way facebook know many people deactivate application or report spam.


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