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bjennings

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Exchange 2010 Changing MX Ip addresses

Hello Everyone,

We are moving to a new ISP in the next week, so I need to change the ipaddress of my mx record.  I have the new static ip address for my email server. Should I create the new mx record now and then when we do the cutover I can remove the old mx record?  Also, we are running exchange 2010,..... do I need to make any changes to the CAS?

Thanks,

BIll
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Manpreet SIngh Khatra
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I dont think any changes to CAS is required as MX is just for email flow.

- Rancy
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tigermatt
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Tigermatt is right on, lower the TTL value on your current MX record to the minimum allowed by your DNS host, like to a minute, then once you mve create the new MX, give it a higher priority then you old one, wait couple of minuted, delete the old one.
Actually, I should probably clarify to be clear:

The record you need to lower the TTL on is the A record (or AAAA, so that this comment is appropriate to IPv6 too!). i.e. the record to which the MX record points - often mail.company.com or smtp.company.com.

Lowering the TTL on the actual MX record (which provides mail exchangers for company.com's domain) is not going to help, because you aren't actually changing the MX record - that is just a pointer to the A record, which will keep the same name.

-Matt
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bjennings

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Thank you so much!