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PHP: Check who had read sent email?
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Inbox notifications - marking as read etc
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Stack Exchange doesn't know when I last checked my global inbox?
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I received an email saying documents are /were
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How to receive email notification of new Facebook messages?
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Get e-mail addresses from Gmail messages received
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"Your order has shipped"
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When an email is forwarded, does it lose its original headers?
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Practical way to find out if SMS has been sent
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How to validate an Email in PHP?
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misspelled "chcecked" in the notification mail
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Does using @user in a question or answer send an inbox-notification to that user?