RFC 987:Mapping between X.400 and RFC 822
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Interworking


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... This Appendix describes a quoting mechanism which may be used to allow general interworking between RFC 822std11(-> 2822prop), and variants of RFC 822std11(-> 2822prop) ...


... Sender: field. To overcome this, new extended JNT Mail field is defined. This is chosen to align with the JNT recommendation for interworking with full RFC 822std11(-> 2822prop) systems [Kille84b]. ...



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