Como descrito em 34,8 Flags controlando o processo de reescrita , use o w
flag para reescrever todo o campo em vez de apenas a parte do email:
Sometimes there is a need to replace the whole address item, and this can be done by adding the flag letter 'w' to a rule. If this is set on a rule that causes an address in a header to be rewritten, the entire address is replaced, not just the working part. The replacement must be a complete RFC 822 address, including the angle brackets if necessary.