Hi everyone,I just had a case which had me looking for said parameter, just to find out that while it's still in the documentation it seems to have been purged from the sources in commit 2bcd79195232042d77b79cbcdbde74f1327e6f8e. Postfix 3.4.19's postconf just gives me a "postconf: warning: /etc/postfix/main.cf: unused parameter: nullmx_reject_code=553"
Kind regards, Andreas
