Include any of mutliple "500" error lines of SMTP server in dead messages failure reasons

When Domino transfers mail to SMTP servers, they might reject this mail with several "550" error lines.

For example:

550-Requested action not taken: mailbox unavailable
550-Sender address is not allowed.
550 1MGz5f-1whpV70KvL-00CPH1

Obviously Domino writes only the last of these lines in the "FailureReason" and "DeadFailureReason" fields of a dead message.

In the example above:
Error transferring to HOST.EXAMPLE.COM; SMTP Protocol Returned a Permanent Error 550 1MtwQm-1x8R463pTI-00w151

So under these circumstances, one is unable to identify the actual reason for rejection looking at the dead messages in mail.box.

It would be nice if Domino would include the whole "multiple line reply" (RFC 2821, 4.2.1) in the reason fields.