New MX question

Hi there,
Our email server is currently getting MX on mail2.company.com
just installed new broadband on a separate line, and will add a new MX in the Control Panel as mail3.company.com
Do I need to do anything on the server  after swapping to the new broadband ?

I know I can just change the MX of mail2 to the new IP, but I would rather keep it as a backup MX so hence the question.

Thanks
CombemartinAsked:
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MAS (MVE)EE Solution Guide - Technical Dept HeadCommented:
Create another MX with a bigger preference.  So both will be working
and  if mail2 is not available it will go to mail3

e.g.
Prefrence                    Name
5                       mail2.compnay.com
6                       mail3.company.com
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Sanjay SantokiCommented:
Hello,

As far as Exchange server is concerned you don't need to do anything except you are using another mail server to deliver and push email to Exchange server or customized receive connectors.

You simply need to configure your broadband to forward required SMTP ports (Mail service ports) to the Exchange server.

In respect of DNS, you have to create low priority MX record to point new broadband IP address so that primarily all the incoming email tries to deliver through new broadband,

Regards,
Sanjay Santoki
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CombemartinAuthor Commented:
Thanks guys,
Just a quick question as to destination.
Currently in my hosting CP, I have this setup as shown in pic.
mail3 already used even though it goes to nowhere, should I just simplify it by adding a mail.company.com instead of mail4.
Also I dont see anywhere where you input the new IP so how would it know where to deliver ?
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CombemartinAuthor Commented:
Sorry, just needed to add a new A within the Advanced DNS before adding new MX, got that now, thanks
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MAS (MVE)EE Solution Guide - Technical Dept HeadCommented:
You should first create an A record poiting to your new server e.g. mail.domain.com->1.1.1.1
Then add MX record mail.domain.com preference less than the previous one
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Neil RussellTechnical Development LeadCommented:
AND

You should have a reverse lookup of the new IP to resolve properly or some mail servers will refuse to send to you. Also if you have SPF records then dont forget to update those as well.
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MAS (MVE)EE Solution Guide - Technical Dept HeadCommented:
@Neilsr
Thanks for adding missed point. I completely forgot to write about reverse DNS and SPF.

@Combemartin
It is important to create reverse DNS and SPF otherwise your mails may bounce back
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CombemartinAuthor Commented:
Thanks Neilsr and Abbasiftt
I had already requested Hostroute to create a SPF on the new IP.
As my current MX is called mail2.xxxxx.xom on the old broadband, and the new MX is called mail4.xxxxx.xom, do I need to do anything at all on the Server/Exchange to reflect the changes of this name ?
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