Change sender's address whem copy a message

[halloo]

Hi,

When a person with email address [email protected] is sending a mail to person B with the address [email protected]. B has set a filter so that he's receiving a copy of all email at [email protected]. The sender that is mentioned in the header is still [email protected].

But we want to change that to the mail address [email protected]. I guess it could be done by editing the rule, but how?

Any suggestions?

Regards,
Paul