That means the ownership and/or permissions set on the file
"/etc/valiases/DOMAIN.tld" are incorrect. Two ways to solve this
problem:
cd /etc/valiases/
chown USERNAME:mail /etc/valiases/DOMAIN.tld
or, ssh to the server and run the following command:
/scripts/fixvaliases
cd /etc/valiases/
chown USERNAME:mail /etc/valiases/DOMAIN.tld
or, ssh to the server and run the following command:
/scripts/fixvaliases