If both this option and &%tls_try_verify_hosts%& are unset
operation is as if this option selected all hosts.
-.option utf8_downconvert smtp integer&!! unset
+.option utf8_downconvert smtp integer&!! -1
.cindex utf8 "address downconversion"
.cindex i18n "utf8 address downconversion"
If built with internationalization support,
to a-label form.
If, after expansion, the value is 1, 0, or -1 then this value overrides
any value previously set for the message. Otherwise, any previously
-set value is used.
+set value is used. To permit use of a previous value,
+set this option to an empty string.
For details on the values see section &<<SECTi18nMTA>>&.