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Solution: If the usage is legitimate and you need your limit increased, contact us at: support@polarismail.com. If you did not send that many e-mails, immediately run a full virus scan of your computer or contact your administrator.
In the user control panel, option Track Deliveries, you are able to see how many messages the account has sent out in the last 24h.
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Solution: Access your account's control panel, Filtering > Blacklist, do a Control F and search for your own e-mail address, then click on the minus sign (-) next to it, to remove it.
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Solution: Change the mentioned option to Accept e-mails from Everyone. Verify both on admin (domain level) and user control panels, by clicking on Filtering, in the top menu.