We are finding that many genuine emails are being sent to our customers without the domain pointing to an A or MX record resulting postfix giving error Sender address rejected. Domain not found
This spam in most cases but in some rare cases these are genuine emails.
We read online that we can whitelist such domains by mentioning the domain name in
check_sender_access pcre:/etc/postfix/sender_access.pcre file.
We tried but this does not work.
Help required please.
# Sender restrictions