如何拦截注册时的临时和一次性邮箱

一次性邮箱的隐藏危险

一次性邮箱地址(DEA)——通常由 Mailinator、10MinuteMail 和 Temp-Mail 等服务提供——允许任何人创建一个在几分钟内自毁的临时收件箱。虽然注重隐私的用户偶尔会使用它们来避免订阅垃圾邮件,但在 SaaS 中,它们绝大多数被用于欺诈性免费试用注册、API 信用滥用和爬虫机器人网络。

允许临时邮箱进入你的 SaaS 数据库会造成直接损害:

• Destroyed Email Deliverability: When automated onboarding emails bounce back from dead disposable inboxes, your sender reputation with SendGrid, Postmark, or AWS SES plunges, routing real customer emails to the spam folder.
• Wasted Free Tier Credits: Abusers deplete costly third-party API keys (OpenAI, Twilio, Stripe) on accounts they will never log into again.
• Polluted Marketing Analytics: Conversion funnels, activation rates, and product telemetry become unreadable due to hundreds of phantom signups.

在注册时执行高邮件卫生的 4 个步骤

1. Normalize Email Addresses on Input: For Gmail and Google Workspace domains, strip all periods (`john.doe` = `johndoe`) and discard everything following a plus sign (`user+trial1` = `user`).
2. Query Live MX Records at the Edge: Verify that the email domain possesses active Mail Exchanger (MX) DNS records configured to receive inbound mail.
3. Block Catch-All Burner Domains: Check the domain against a continuously updated registry of temporary email proxy servers.
4. Require Business Email for High-Value Features: For enterprise tiers or heavy compute trials, disallow free webmail domains (`@gmail.com`, `@yahoo.com`, `@hotmail.com`) entirely.

常见问题