using the SMTPUTF8 option on their MAIL FROM commands, in one connection.
Previously the "utf8" would be re-prepended for every additional message.
+JH/19 Reject MAIL FROM commands with SMTPUTF8 when the facility was not advertised.
+ Previously thery were accepted, resulting in issues when attempting to
+ forward messages to a non-supporting MTA.
+
Exim version 4.91
-----------------