Don't check spam from some domains

[sheroku]

Hello

My customers need to pass all e-mail without spam/virus check, so I deisabled all spamassassin and I added

if $header_to: contains "@domain.com" or $header_from: contains "@domain.com"
then
  finish
endif

to /etc/system_filter.exim, but they said some e-mail lost.

Every answer will be appreciate,
Sheroku