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Everything about SMTP proxy

Mail server type

SMTP proxies are specialized mail servers that, similar to other types of proxy servers, pass simple mail transfer protocol (SMTP) sessions through to other SMTP servers without using the store-and-forward approach of a mail transfer agent (MTA). When an SMTP proxy accepts a connection, it initiates another SMTP session to a destination SMTP server. Any errors or status information from the destination server will be passed back to the sending MTA through the proxy. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: SMTP proxyA 5-minute orientation
  2. Pick up a classic book: The web application hacker's handbookThe most-reprinted book on the subject
  3. Go sideways: Email filteringA closely related topic
  4. Go sideways: Tarpit (networking)A closely related topic

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🗂️ The subject at a glance

  1. Uses
  2. Types of SMTP proxies

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