+# When using an external relay tester (such as rt.njabl.org and/or the
+# currently defunct relay-test.mail-abuse.org, the test may be aborted
+# since exim complains about "too many nonmail commands". If you want
+# the test to complete, add the host from where "your" relay tester
+# connects from to the MAIN_SMTP_ACCEPT_MAX_NOMAIL_HOSTS macro.
+# Please note that a non-empty setting may cause extra DNS lookups to
+# happen, which is the reason why this option is commented out in the
+# default settings.
+# MAIN_SMTP_ACCEPT_MAX_NOMAIL_HOSTS = !rt.njabl.org
+.ifdef MAIN_SMTP_ACCEPT_MAX_NOMAIL_HOSTS
+smtp_accept_max_nonmail_hosts = MAIN_SMTP_ACCEPT_MAX_NOMAIL_HOSTS
+.endif