Mx records

This topic contains 7 replies, has 6 voices, and was last updated by Avatar deepakchaudhari22 7 years, 8 months ago.

Viewing 8 posts - 1 through 8 (of 8 total)
  • Author
    Posts
  • Avatar
    necro
    Member
    #157468

    Hi all,

    We are managing our own exchange server 2003. Currently we are using ISP A. We are about to change to ISP B with new public ip.

    Before the migration, i just need to do some step just to make things clear.

    I check my mx record, and it is in the form of ‘mail.mydomain.com.my’.
    The question is, how i am going to change the mx record to reflect the new public ip?

    Avatar
    joeqwerty
    Moderator
    #303751

    Re: Mx records

    You don’t change the MX record. The MX record points to a host record (A record). You need to change the host record to point to the new ip address.

    Avatar
    shorbagy
    Member
    #378332

    Re: Mx records

    Thanks for the reply,

    I check my domain under the foward lookup zone, it shows


    mail Mail Exchanger(MX) [11] mail.mydomain.com.my
    mail Host (A) 192.168.100.250



    We only have 1 mx record.
    So I’m confuse, the A record point to the internal ip, not the public ip?

    Avatar
    Ossian
    Moderator
    #185897

    Re: Mx records

    You need to look at your PUBLIC DNS records, not your internal ones
    In most domains, there is no need to create internal MX records

    Avatar
    Virtual
    Member
    #334096

    Re: Mx records

    If your internal DNS domain is different to your external, you will also need to setup split DNS internally to ensure that users on the internal network connecting to the internal servers for OWA etc do not use the the external IP to do so but the internal one of the Exchange server.

    #384516

    Re: Mx records

    Ossian;252099 wrote:
    You need to look at your PUBLIC DNS records, not your internal ones
    In most domains, there is no need to create internal MX records

    From my own experience when I added new domains to my Exchange, you contact your domain name holder company or log on to your DNS record management console and change the MX record for your domain name.
    The usual time it takes for the change to sync around the globe DNS servers is 24h, but for us it was in few hours.

    So as Ossian said, conntact the public domain name holder and ask for MX record IP change.

    Avatar
    shorbagy
    Member
    #378333

    Re: Mx records

    Thank you all,

    So back to the question. do i need to change my mx record?

    The firewall things i know what to do ( change the new public ip, policy).
    I’m worried about the Exchange setting, what should i do for the transition.

    I know that :
    old ISP dns : 1.1.1.1
    new ISP dns : 2.2.2.2

    Should I change the fowarder also?
    Because now it pointing to the old dns

    Avatar
    Ossian
    Moderator
    #185903

    Re: Mx records

    Has your public IP changed?
    If so, you will need to change your DNS records

    Your old ISP may allow public DNS access, if so you will not need to change DNS forwarders, however the new ISP may offer better performance. Alternatively there are 3rd parties such as OpenDNS who offer public DNS servers

Viewing 8 posts - 1 through 8 (of 8 total)

You must be logged in to reply to this topic.