[exim] How to drop emails from phantom user

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Lähettäjä: Jorge
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Vastaanottaja: exim-users
Aihe: [exim] How to drop emails from phantom user
Hi,

I receive a lot of mails from several spammers that hides the real sender, for example, the from field, may be:

From: "SomeText In the from field" <someuser@???>

I want to drop all emails received that have "SomeText" or "sometext" or any combination of cases.

Can anyone help me and say me what and where I must to put in configure exim file?

And, If I want to apply the same restriction but only to one account under my virtualhost?

Thanks in advance.

Jorge Colaccini