[EXIM] Mail to multiple users fails

HPUX 10 system, running Elm and Exim 1.92:

Local mail sent by Elm to one person works fine.
Mail sent to more than one person at a time fails with
'unknown local part'; as if Exim was trying to parse

'user1 user2 user3'@domain

as a single mail message.

Is this Exim or Elm configuration that's going wierd;
this arrangement had worked with sendmail before.

Any suggestions are appreciated.

- Evan


--
*** Exim information can be found at http://www.exim.org/ ***