Hi here's the details to my 'pull my hair out' problem: We're a design agency with our own VPS that is running Plesk 9.3 for Linux/Unix. Our email (qmail) is able to send and receive all mail APART from being able to send to our mail client at a single domain. None of the emails are getting through to them and they are a multinational company. Emails to them simply end up in our mail queue. We have no issues receiving from them or sending out to anyone else. Bounced error message reads: CNAME lookup failed temporarily. (#4.4.3) I'm not going to try again; this message has been in the queue too long. but I've raised a support ticket with their tech guys and there's no blacklist on our IP address. So I'm at a lost as to what the issue could be. This only started happening about a week ago, and we've no issues for the last 3 years. Also, our qmail service in plesk seems to stop itself every so often and I have to restart it through plesk or no emails will come in. Our settings are as seen in the screenshot. Is this normal?