[Exim] Can Exim accept sender addresses without a @-characte…

Hello

I have a pretty big problem. A stupid but important application in our
company sends e-mails with a fix sender address like 'version20'.
There's no @-character or domainname. How can I configure Exim to accept
and deliever such messages?

I'd be glad if someone could help me. Please send the answer to my
e-mail address remo.goetschi@???

kind regards and thanks a lot,

Raymond