SAFE Mode with Exim:
If you don't already have one, you'll need to add a local ACL file for the RCPT ACL check.
On a split config, add something like the following to:
/etc/exim4/conf.d/00_local_config
CHECK_RCPT_LOCAL_ACL_FILE=/etc/exim4/local_acl_check_rcpt
Then edit /etc/exim4/local_acl_check_rcpt:
deny senders = :
dnslists = bl.drmx.org
log_message = $sender_host_address listed at $dnslist_domain
message = DrMX: $dnslist_text
SAFE MODE with Postfix:
Edit /etc/postfix/main.cf:
smtpd_recipient_restrictions =
...
check_sender_access dbm:/etc/postfix/check_drmx
...
Create new file: /etc/postfix/check_drmx:
<> reject_rbl_client bl.drmx.org
postmaster reject_rbl_client bl.drmx.org
Execute following commands:
postmap /etc/postfix/check_drmx
postfix reload
for changes to take effect.
NOTE: Use of any DrMX.ORG DNS Zone is by request and by contract only.