We use Yandex mail for our mails (with our domain). All emails can recieve mails except one email account. When we try to send mail from any gmail or hotmail account to the email we have that error;
DNS Error: 6111650 DNS type 'mx' lookup of EXAMPLE.COM responded with code NXDOMAIN Domain name not found: EXAMPLE.COM
aaa@example.com - work
bbb@example.com - work
ccc@example.com - not work
Thanks in advance