exim_path = EXIM_PATH
host_lookup_order = bydns
primary_hostname = myhost.test.ex
-rfc1413_query_timeout = 0s
spool_directory = DIR/spool
log_file_path = DIR/spool/log/%slog
gecos_pattern = ""
acl_smtp_rcpt = accept
qualify_domain = test.ex
-errors_copy = *@* ${quote_local_part::abcd+$domain+$local_part}@test.ex
+errors_copy = *@* ${quote_local_part::abcd+$domain+\
+ ${if eq{$local_part}{CALLER}{xxxx}{$local_part}}}@test.ex
trusted_users = CALLER