Mail bomb

It is often done by signing a victim’s address up to many mailing lists. Confirming each subscription by email, and limiting how often one address can be submitted, stops your forms being used for it.

Verification at signup does not stop it, but double opt-in and rate limiting do.

• DDoS
• Double opt-in
• Contact form
• Verify a list
• Topic: Spam and blocklists
• Topic: Email technical
• All terms