Add the new domain through the iredadmin panel – hostdomain.com/iredadmin

Server

1. Generate domain keys for the new domain:

amavisd-new genrsa /var/lib/dkim/newdomain.co.uk.pem

2. Edit the amavis conf file:

vim /etc/amavis/conf.d/50-user

Change @local_domains_maps = 1; to:

@local_domains_maps = ['.'];