hi all, i have Exchange 2010 organization for domain abc.com, and another company xyz.com which hosting their exchange with the ISP i want to make them use my exchange server as their email provider, i have the following link for the configuration http://technet.microsoft.com/en-us/library/aa996314.aspx my question is regarding the MX for the xyz.com company they have to change their it to point to the same IP address abc.com company pointing to or a new IP? and during the change of the MX record what will happen to the emails they receive? ThanksTarek Khairy

On Mon, 3 Sep 2012 09:57:11 +0000, tkhiry wrote: > > >hi all, > >i have Exchange 2010 organization for domain abc.com, and another company xyz.com which hosting their exchange with the ISP > >i want to make them use my exchange server as their email provider, i have the following link for the configuration > >http://technet.microsoft.com/en-us/library/aa996314.aspx > >my question is regarding the MX for the xyz.com company they have to change their it to point to the same IP address abc.com company pointing to or a new IP? Yes. >and during the change of the MX record what will happen to the emails they receive? Thanks That depends on whether the MTA at the address the MX references still accepts mail for that domain. If it does, the mail woill be delivered there. If it doesn't the mail will be returned as undeliverable. --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP

On Mon, 3 Sep 2012 09:57:11 +0000, tkhiry wrote: > > >hi all, > >i have Exchange 2010 organization for domain abc.com, and another company xyz.com which hosting their exchange with the ISP > >i want to make them use my exchange server as their email provider, i have the following link for the configuration > >http://technet.microsoft.com/en-us/library/aa996314.aspx > >my question is regarding the MX for the xyz.com company they have to change their it to point to the same IP address abc.com company pointing to or a new IP? Yes. >and during the change of the MX record what will happen to the emails they receive? Thanks That depends on whether the MTA at the address the MX references still accepts mail for that domain. If it does, the mail woill be delivered there. If it doesn't the mail will be returned as undeliverable. --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP

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thanks for the reply, do i need to have a new IP address for the new MX record on my firewall or i can point the same IP i already have.Tarek Khairy

On Wed, 5 Sep 2012 06:36:59 +0000, tkhiry wrote: >thanks for the reply, do i need to have a new IP address for the new MX record on my firewall or i can point the same IP i already have. MX records don't use IP addresses, they refer to "A" records. You can have any number of MX records for the same, or different, domains refer to the same "A" record name. --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP