+to-Alabel convert of helo name
+- smtp transport
+
+++ An "international" flag on the message?
+++ An is-international expansion condition?
+
+++ helo-time option handling
+++ conversion of utf-8 domains for DNS rfc5890
+-- MSA mode: convert on forward?
+--- mua-wrapper
+--- acl control?
+
+++ flag in spool file
+
+retries
+- apply to a-label or utf8 form?
+
+dsn handling rfc6533
+- ORCPT param: utf8 vs. unitext encoded
+-- to/from unitext expansions ( foo\x{HEXPOINT} - 2-6 hex digits )