I am receiving an error sending e-mail

If you are receiving the following error message or bounceback:

550 5.7.1 [CSR] Our system has detected an unusual amount of unsolicited email originating from your address

This means that our systems have detected that your mailbox has been used to send a significant amount of spam in the last 24 hours. It is highly probable that your mailbox has been compromised and your password has been exposed, allowing an attacker to hi-jack your account and send spam without your knowledge. We strongly recommend that you change your mailbox password immediately to something more secure. Once the account has been secured, this error will clear within 24 hours.
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