[Mimedefang] relaydelay blocking fake domain

[Chris Henderson]

I use relay delay to block/trap spam. For the last few days I am
getting spams from a fake domain. I need to quarantine any messages
coming from that fake domain. AFAIK, relaydelay can only white or
black list IPs/subnets and cannot take any rules to block fake
domains.

Is there any way I can achieve this? I don't have much experience with
relaydelay. Thanks for any help.