About
Quoth The Maven, Yet another Blosxom blog.

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RFC 3463 Redux
This is just the abbreviated list of RFC3463 status codes for the SMTP email protocol.

Status Code Structure
      2.XXX.XXX Success
      4.XXX.XXX Persistent Transient Failure
      5.XXX.XXX Permanent Failure

        X.0.XXX  Other or Undefined Status
          X.0.0   Other undefined Status

        X.1.XXX  Addressing Status
          X.1.0   Other address status
          X.1.1   Bad destination mailbox address
          X.1.2   Bad destination system address
          X.1.3   Bad destination mailbox address syntax
          X.1.4   Destination mailbox address ambiguous
          X.1.5   Destination address valid
          X.1.6   Destination mailbox has moved, No forwarding address
          X.1.7   Bad sender's mailbox address syntax
          X.1.8   Bad sender's system address

        X.2.XXX  Mailbox Status
          X.2.0   Other or undefined mailbox status
          X.2.1   Mailbox disabled, not accepting messages
          X.2.2   Mailbox full
          X.2.3   Message length exceeds administrative limit
          X.2.4   Mailing list expansion problem

        X.3.XXX  Mail System Status
          X.3.0   Other or undefined mail system status
          X.3.1   Mail system full
          X.3.2   System not accepting network messages
          X.3.3   System not capable of selected features
          X.3.4   Message too big for system
          X.3.5   System incorrectly configured

        X.4.XXX  Network and Routing Status
          X.4.0   Other or undefined network or routing status
          X.4.1   No answer from host
          X.4.2   Bad connection
          X.4.3   Directory server failure
          X.4.4   Unable to route
          X.4.5   Mail system congestion
          X.4.6   Routing loop detected
          X.4.7   Delivery time expired

        X.5.XXX  Mail Delivery Protocol Status
          X.5.0   Other or undefined protocol status
          X.5.1   Invalid command
          X.5.2   Syntax error
          X.5.3   Too many recipients
          X.5.4   Invalid command arguments
          X.5.5   Wrong protocol version

        X.6.XXX  Message Content or Media Status
          X.6.0   Other or undefined media error
          X.6.1   Media not supported
          X.6.2   Conversion required and prohibited
          X.6.3   Conversion required but not supported
          X.6.4   Conversion with loss performed
          X.6.5   Conversion Failed

        X.7.XXX  Security or Policy Status
          X.7.0   Other or undefined security status
          X.7.1   Delivery not authorized, message refused
          X.7.2   Mailing list expansion prohibited
          X.7.3   Security conversion required but not possible
          X.7.4   Security features not supported
          X.7.5   Cryptographic failure
          X.7.6   Cryptographic algorithm not supported
          X.7.7   Message integrity failure

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