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MX Records

Discussion in 'Network Infrastructure' started by zimbo, Jul 31, 2006.

  1. zimbo
    Honorary Member

    zimbo Petabyte Poster

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    Now guys lets not get too technical as this is the first shot at something like this. What exactly does an MX record do and if you could illustrate with an example please?

    Thanks!
     
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  2. zimbo
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    zimbo Petabyte Poster

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    im going to answer my own question now! :biggrin

    http://bobcares.com/article3.html

    so if you got no mail server in your domain there is no need for this?
     
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  3. Boycie
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    Boycie Senior Beer Tester

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    Zim,

    As far as i am aware, an MX record is a record about a particular domain i.e which server to point the senders request to ...

    Si
     
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  4. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    Being pedantic - not quite true.

    Amend it to read "If I don't want any mail to my domain then there is no need for this". If you *do* want mail then you should indicate what machine handles it - it doesn't have to be on your domain.

    Harry.
     
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  5. zimbo
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    zimbo Petabyte Poster

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    alright thanks harry!
     
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  6. zimbo
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    zimbo Petabyte Poster

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    umm i think you talking about SRV records... they point clients to particular Services like LDAP
     
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  7. _omni_

    _omni_ Megabyte Poster

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    LDAP
    [​IMG]
     
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  8. zimbo
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    zimbo Petabyte Poster

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    yes yes omni! thank you for pointing it out! :tongue

    here have an italian beer

    [​IMG]
     
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  9. zimbo
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    zimbo Petabyte Poster

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    so in the end thats what an MX record is? points to the mail server so email know where the mail server is in the domain?
     
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  10. _omni_

    _omni_ Megabyte Poster

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    Why thank you! I guess being a spelling nazi does have its occasional rewards...besides an overinflated ego. :P
     
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  11. zimbo
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    zimbo Petabyte Poster

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    it was actually typing it out sparky!:twisted: :twisted:
     
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  12. _omni_

    _omni_ Megabyte Poster

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    My name is omni, thank ye very much.:dry
     
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  13. zimbo
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    zimbo Petabyte Poster

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    ok and im benito! :shades

    :offtopic
     
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  14. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    Yes - although I'm going to be pedantic again and say:
    "knows where the mail server is for the domain".

    The point here is that a mail server for a domain doesn't have to reside *in* that domain.

    Mind you - this is true in the Internet at large - M$ may have ****ed things up and insist on it being in the domain - but I don't think they have. :biggrin

    Harry.
     
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  15. zimbo
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    zimbo Petabyte Poster

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    i was thinking about that... so lets say the DNS server is for domain1.com and the mail server is in domain2.com the MX record will contain the domain2.com because thats where the mail server will need to sort out email right?
     
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  16. fortch

    fortch Kilobyte Poster

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    Has this been answered? Simply, a Mail eXchange record, and you need to deal with these anytime time you administer a mail system utilizing DNS. Just because you don't host a mail server in your domain, doesn't mean you don't have to deal with MX records. For example, I admin a (beta) gmail domain for my church, as it's website is hosted at my house, but I don't want the hassle and bandwidth issue from having a mailserver on my network. So, I setup a gmail domain, and had to list the MX records in ZoneEdit. Voila! Free DNS, domain email, and no administration, outside of redirectors and setup.

    Source

    More info from M$ here.
     
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  17. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    Correct! Here is a real example:
    The mailservers for demon.co.uk are actualy in mail.demon.net.

    Harry.
     
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  18. zimbo
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    zimbo Petabyte Poster

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    Thanks everyone! going to head back to the books now!:biggrin :biggrin
     
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  19. Sparky
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    Sparky Zettabyte Poster Moderator

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    Just to give another example when installing a small business network generally there is one ‘real world’ I.P address. The MX record points to that I.P address (which is probably assigned to a firewall device) and then port 25 is forwarded to the static I.P of your mail server. Allow the recipient policy of Exchange to accept mail for @yourdomain.com and then the mail can receive email.

    Outbound email can be resolved by internal DNS or by a smart host, but that’s a different topic! :biggrin
     
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