Changing a host record for mail

I have a client who hosts with me and they use Microsoft Exchange Server. They asked me to do 2 things. Can anyone explain how this is done - ASAP!

1) Change the MX records for each domain

2) Change the Host Record for Mail to: 209.42.xx.xx

I think I got the first one, but how do you do the second? I am a reseller, so is this something that needs to be done by the server admin or can I do it?

Thanks in advance for any help!!

 

 

 

 

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