The primary issues with unsolicited bulk emails include:
1. Annoyance: Recipients find them bothersome and intrusive. 2. Security Risks: They often contain malware or phishing links that can compromise personal information. 3. Reputation Damage: Sending spam can severely harm a company's reputation and lead to blacklisting. 4. Legal Consequences: Many countries have stringent anti-spam laws that set heavy penalties for sending unsolicited emails.