| Attribute | Must | Description |
|---|---|---|
| Common-Name | X | X.500 Common Name (DN of this object) |
| N-Address | X.400 - The N-Address portion of this MTA's Presentation Address | |
| N-Address-Type | X.400 - If not specified, defaults to Network Address | |
| P-Selector | X.400 - The P-Selector portion of this MTA's Presentation Address | |
| S-Selector | X.400 - The S-Selector portion of this MTA's Presentation Address | |
| T-Selector | X.400 - The T-Selector portion of this MTA's Presentation Address | |
| X400-Selector-Syntax | Specifies the syntax of the P, S, & T selecters (0 or undefined=Hex, 1=Text) |