Permission to send emails to the contacts on your list is extremely important. Without permission from your contacts you risk the following:

The emails you send may be classified as spam by ISPs or recipients.
Violating our Terms of Use and Anti-Spam policies and those pertinent to your country. Your account can be terminated as a result.
Violating anti-spam laws and could get sued for doing so.
Generating complaints, resulting in IPs getting blocked at major ISPs all over the world.
Getting blacklisted for sending spam, which could filter down to your own domain and/or your hosting provider. If this happens, your hosting provider could terminate your account and you could lose your website, email and hosting service.

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