[exim] Redirect and errors_to variables

I need to rewrite "MAIL FROM" in redirect driver to send mail not in my local
domains. But, the "erros_to" not show variables, only fixed address... The
header_add is ok!

virtual_aliases:
  driver                = redirect
  errors_to             = ${local_part}@${domain}  <- Not run
  headers_add           = "X-Envelope-To: ${local_part}@${domain}\n"

virtual_aliases:
  driver                = redirect
  errors_to             = fix@???  <- Run OK!
  headers_add           = "X-Envelope-To: ${local_part}@${domain}\n"

I need to rewrite the sender address in "Mail from" to external out email
because the SPF block these redirects... The SRS is not easy to use... I try to
use $address_data and result is equal...

Cordialmente, Silmar A. Marca
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