need help to sync mailbox with existing domain and dns records

i need help and still new on virtualmin im running on UBUNTU x64 server and i have been installed successfully, now i have other problem and i want to ask

  1. i have existing domain hosting and i want to sync with my domain , i have been set my hostname , mail username , and password same as my existing domain but why my inbox is not synced ? but i can send mail.

note :

  • telnet to my ip address port 110 and 587 is ok.
  1. im leave dns records as default like this :

    $ttl Default Cache Time 38400 SOA - Start Of Domain 1377950781 10800 3600 604800 38400 NS - Name Server A - IPv4 Address
    www A - IPv4 Address
    ftp A - IPv4 Address
    m A - IPv4 Address
    localhost A - IPv4 Address
    webmail A - IPv4 Address
    admin A - IPv4 Address
    mail A - IPv4 Address MX - Mail Server 5 mail.xxxxcom. SPF - Sender Permitted From v=spf1 a mx ip4: ?all

does something wrong ?please guide me , and thanks verry much for your help

  1. What do you mean with “inbox not synced”? Please explain the problem step-by-step.

  2. Can you elaborate the question? Are you having any problems with the zone file?