I have one domain that's been on one of my VPS's for a while now and for the past couple of weeks it's started coming up daily in a cPanel -> MailScanner Report email:
I get the email at midnight every night at the moment. Is there a way for me to stop this as the domain isn't new and has always had it's email services turned on!?
That usually happens if you have corruption or an invalid entry in /etc/localdomains or /etc/secondarymx. You need to go through those files and ensure that they're simply domain names. No spaces, no hashes, etc.