Hello, you have missed your nameserver in SOA record. Also host mta its not a mail that you are want to be your MX.
here is fixed zone file:
docjul.com. IN SOA ns1.docjul.com. admin.docjul.com. (
2007031001 ;Serial Number
docjul.com. IN NS ns1.docjul.com.
docjul.com. IN A 126.96.36.199
docjul.com. IN MX 10 mail.docjul.com.
ns1 IN A 188.8.131.52
mail IN CNAME docjul.com.
www IN CNAME docjul.com.
mta IN A 184.108.40.206