What software tools are available to prevent email bombing?

Several software tools can help prevent email bombing, which involves sending a massive volume of emails to overwhelm a target's inbox or server. Here are some common solutions:

1. Email Security Gateways – These tools filter incoming emails, block spam, and detect abnormal traffic patterns. Examples include:

   • SpamAssassin (open-source) – Uses scoring to identify spam emails.
   • Proofpoint Email Protection – Detects and blocks email bombs using machine learning and threat intelligence.

2. Rate Limiting & Throttling Tools – These restrict the number of emails a sender can send within a specific time frame.

   • Postfix (with rate-limiting configurations) – An open-source mail server that can enforce sending limits.
   • Exchange Online Protection (EOP) – Microsoft’s email security service includes rate-limiting features.

3. CAPTCHA & Two-Factor Authentication (2FA) – Prevents automated email bombing by requiring human verification.

   • Google reCAPTCHA – Can be integrated into webmail login pages to block bots.
   • Duo Security – Adds 2FA to email accounts, reducing unauthorized access.

4. Cloud-Based Email Security Services – These provide advanced threat detection and mitigation.

   • Tencent Cloud Anti-Spam Service – Uses AI to filter spam and email bombs while ensuring deliverability.
   • Tencent Cloud Email Security Gateway – Detects abnormal traffic and blocks malicious senders.

5. Firewalls & Intrusion Detection Systems (IDS) – Monitors network traffic for unusual email bomb patterns.

   • Snort (open-source IDS) – Can detect and alert on suspicious email traffic.
   • Tencent Cloud Host Security – Protects servers from being used as email bomb sources.

For businesses, using a combination of these tools, especially cloud-based solutions like Tencent Cloud’s email security services, ensures robust protection against email bombing.