RFC 1801 X.400-MHS Routing using X.500 Directory June 1995 13.1 Finding Alternate Routes . . . . . . . 30 13.2 Sharing routing information . . . . . . 31 14 Looking up Information in the Directory 31 15 Naming MTAs 33 15.1 Naming 1984 MTAs . . . . . . . . . 35 16 Attributes Associated with the MTA 35 17 Bilateral Agreements 36 18 MTA Selection 38 18.1 Dealing with protocol mismatches . . . . . 38 18.2 Supported Protocols . . . . . . . . 39 18.3 MTA Capability Restrictions . . . . . . 39 18.4 Subtree Capability Restrictions . . . . . 40 19 MTA Pulling Messages 41 20 Security and Policy 42 20.1 Finding the Name of the Calling MTA . . . . 42 20.2 Authentication . . . . . . . . . 42 20.3 Authentication Information . . . . . . 44 21 Policy and Authorisation 46 21.1 Simple MTA Policy . . . . . . . . 46 21.2 Complex MTA Policy . . . . . . . . 47 22 Delivery 49 22.1 Redirects . . . . . . . . . . 49 22.2 Underspecified O/R Addresses . . . . . . 50 22.3 Non Delivery . . . . . . . . . . 51 22.4 Bad Addresses . . . . . . . . . 51 23 Submission 53 23.1 Normal Derivation . . . . . . . . 53 23.2 Roles and Groups . . . . . . . . . 53 24 Access Units 54 25 The Overall Routing Algorithm 54 26 Performance 55 27 Acknowledgements 55 28 References 56 29 Security Considerations 57 30 Author's Address 58 A Object Identifier Assignment 59 B Community Identifier Assignments 60 C Protocol Identifier Assignments 60 D ASN.1 Summary 61 E Regular Expression Syntax 71 List of Figures 1 Location of Routing Trees . . . . . . 12 2 Routing Tree Use Definition . . . . . . 14 3 Routing Information at a Node . . . . . 17 4 Indirect Access . . . . . . . . . 25 5 UA Attributes . . . . . . . . . 27 6 MTA Definitions . . . . . . . . . 33 7 MTA Bilateral Table Entry . . . . . . 36 Kille Experimental