| Attribute | Must | Description |
|---|---|---|
| Association-Lifetime | Used by the MTA when transferring messages within the Messaging Domain | |
| Common-Name | X | |
| Domain-Def-Alt-Recip | Specifies the recipient to use when all routing fails. (dead-letter-recipient) | |
| Message-Tracking-Enabled | ||
| Num-Of-Open-Retries | X.400 - Number of times the MTA tries to establish a remote connection (20) | |
| Num-Of-Transfer-Retries | X.400 - Number of times the MTA tries to resend a block of data (20) | |
| Open-Retry-Interval | Used by the MTA when transferring messages within the Messaging Domain | |
| RTS-Checkpoint-Size | X.400 - Size of data in K that is transfered in a block (1-4) | |
| RTS-Recovery-Timeout | X.400 - Max number of seconds before aborting recovery of a connection (10) | |
| RTS-Window-Size | X.400 - Number of Checkpoints that are sent before an ACK is expected | |
| Session-Disconnect-Timer | X.400 - Number of seconds the MTA waits for an ACK after a session disconnect | |
| Temp-Assoc-Threshold | When the queued messages reaches this value, another association is started | |
| Transfer-Retry-Interval | X.400 - Number of seconds the MTA waits before re-sending a message (10min) | |
| Transfer-Timeout-Non-Urgent | X.400 - Max transfer time/K to transmit a Non-Urgent message | |
| Transfer-Timeout-Normal | X.400 - Max transfer time/K to transmit a Normal message | |
| Transfer-Timeout-Urgent | X.400 - Max transfer time/K to transmit an Urgent message | |
| Transport-Expedited-Data | X.400 - Used only if supported on the other end of the connection | |
| XMIT-Timeout-Non-Urgent | ||
| XMIT-Timeout-Normal | ||
| XMIT-Timeout-Urgent |