Users of a message transfer system are identified by an Originator/Recipient (O/R) name. The O/R name is included on the P1 envelope and is used by the MTS to route and deliver messages.
Microsoft Exchange Server automatically creates X.400 addresses for every mailbox based on the site and organization name you specify during Setup. It is important to understand the elements of O/R addresses to modify the site address, create custom recipient addresses, and specify the addresses of other X.400 systems in the X.400 Connector configuration.
The O/R address is comprised of required and optional fields containing attributes and values. The attributes necessary for a valid address vary depending on the recipient system. All attributes are not required for delivery in an X.400 system. Once the correct attributes are identified, the attribute and its value are combined in an address format with an equal sign (=) separating the two. A delimiter is added between fields for parsing reasons. X.400 fields can be separated by a semicolon (;) or a slash (/). Different systems can require different delimiters.
You can use either the abbreviation or the label to identify an attribute. The following table shows valid abbreviations and labels, as well as the maximum length allowed for the value. The DDA field is case sensitive; the other attributes are not.
Attribute Type | Abbreviation | Label | Maximum Characters | |
Given name | Given name | G | 16 | |
Initials | Initials | I | 5 | |
Surname | Surname | S | 40 | |
Generation qualifier | Generation | Q | 3 | |
Common name | Common name | CN | 32 | |
X.121 address | X.121 | X.121 | 15 | |
User agent numeric ID | N-ID | N-ID | 32 | |
Terminal type | T-TY | T-TY | 3 | |
Terminal identifier | T-ID | T-ID | 24 | |
Organization | Organization | O | 64 | |
Organizational unit 1 | Org.Unit.1 | OU1 | 32 | |
Organizational unit 2 | Org.Unit.2 | OU2 | 32 | |
Organizational unit 3 | Org.Unit.3 | OU3 | 32 | |
Organizational unit 4 | Org.Unit.4 | OU4 | 32 | |
Private management domain name | PRMD | P | 16 | |
Administrative management domain name | ADMD | A | 16 | |
Country | Country | C | 2 | |
Domain defined attribute | DDA | DDA | 8, 128 | |
DDA uses the format DDA:type=value; for example, DDA:SMTP=MariaBlack@fab.com. There may be up to four DDAs in a single X.400 address. DDAs are order dependent. When parsing from left to right, the first DDA is encoded first, the second DDA is encoded second, and so on.
With the exception of DDA, the format for the fields is Label=Value; for example, g=Joe. The following are examples of valid X.400 addresses using labels and different delimiters: