全收电子邮件
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全收电子邮件地址是一个配置为接收发往域名内任何不匹配现有邮箱地址的邮件的邮箱，而不是将其退回。例如，如果只存在[email protected]，全收设置也会投递[email protected]或[email protected]的邮件。虽然便于捕获误发邮件，但全收配置是垃圾邮件发送者的主要攻击目标，他们会向域名随机地址发送大量邮件并依赖全收功能投递。大多数[[email-hosting|电子邮件托管]]提供商将全收作为可选设置提供，与[[email-alias|电子邮件别名]]不同。
示例
A small business with catch-all enabled receives mail sent to support@, billing@, and sales@ even though only hello@ is formally configured — useful during onboarding, but increases spam exposure significantly.