Most often these are a clear give-away that the website may be malicious.
However, if a long-lost brother finds your email address and sends you a message, this could hardly be called spam, even though it is unsolicited. Terms and Conditions. Keep it that way with a few simple precautions. Try Before You Buy.
See also... Don't be afraid to change your public email address often. Webopedia Why is it Bad?
Security 41. Additional useful and detailed information on phishing: Search for: Choose an antivirus and Internet security solution that also includes advanced anti-spam features.