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Article ID: 3200, created on Nov 30, 2007, last review on May 10, 2014

  • Applies to:
  • H-Sphere


POP before SMTP

An SMTP based protocol, in which the relay system collects IP addresses of users who successfully authenticate themselves with a POP server, and then permits SMTP relaying from that IP address for a short period of time.


An SMTP based protocol, in which the client must send a name and password in addition to the normal SMTP envelope information. This requires a special client, which has been configured to use this protocol.

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