F11-AX: No
Rationale
The selected classic circuit service has transient transmit queues and retries, not an offline message-retention service. Its routing flowchart discards a frame when no destination entry exists or all attempted next-hop crosslinks fail. Queueing while an active route is available is not a promise to retain an admitted message for later delivery after disconnection; a BBS mailbox is outside this profile.
Assessment method
Pinned release-source analysis and primary protocol review; no runtime execution
Source context
The NET/ROM Protocol, pp. 1–3 and routing flowchart p. 7 (visually inspected)