- we could send QUIT, do TLS close, etc - call it a message error.
- Otherwise, if all the recipients have been dealt with, call a close no
- error at all; each address_item should have a suitable result already
- (2xx: PENDING_OK, 4xx: DEFER, 5xx: FAIL) */
+ we could send QUIT, do TLS close, etc - it is a message error.
+ If not, and all the recipients have been dealt with, call such a close
+ no error at all; each address_item should have a suitable result already
+ (2xx: PENDING_OK, 4xx: DEFER, 5xx: FAIL).
+ Otherwise, it is a non-message error. */