-keep_environment = PATH:SSLKEYLOGFILE:EXIM_TESTHARNESS_DISABLE_OCSPVALIDITYCHECK
+keep_environment = PATH:EXIM_TESTHARNESS_DISABLE_OCSPVALIDITYCHECK
+add_environment = SSLKEYLOGFILE=DIR/spool/sslkeys
exim_path = EXIM_PATH
host_lookup_order = bydns
spool_directory = DIR/spool