I have my server with virtualmin and webmin. All My sites was working fine! But now, only sites www.mydomain.com work, the mydomain.com is not working. I cant receive emails. What, where to checк?
I have namecheap.com account, if this info will help.
Your DNS may be set incorectly, or you might have changed your nameservers, or they may have gone off-line (doubtful, but possible). Check to make sure you are using your ISP’s correct nameserver addresses. Also make sure rDNS is set properly, email servers do like that working 100% these days, thankfully.