recipient = rcpt-address
original_recipient = rcpt-orig_addr
offset = 271
notify_flags = rcpt-dsn_notify
status = dsn-status
action = dsn-action
diag_type = dsn-dtype
diag_text = dsn-dtext
mta_type = dsn-mtype
mta_mname = dsn-mname
reason = dsn-reason