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3) You have four or more items in your outbox that match certain filtering criteria. Namely, four emails improperly addressed. When this happens and the SMTP connection cannot be completed the server assumes you are a spammer trying to send arbitrary emails to the general Internet population. It then blocks you.
Solution: Purge your local outbox after verifying your To: line is incorrect, wait a few minutes (close your email reader) and try again.
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