Receiving Email From Another Domain To Our Exchange

Hi All,

Fairly new to this and never done this before, we have a office with a .com domain which we are coming on board with us and they would like their mail routed through our exchange server as they are moving internet providers as well but still obviously want to keep their domain info etc.

We are running exchange 2013 and any help besides the obvious changing the MX records on their end will be most helpful.

Not sure where to turn regarding getting their mail flowing through our exchange other than changing their MX records etc.

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Vikas BhatExperienced IT Infrastructure Services/operations ManagerCommented:

Please follow instructions on below link
Pete LongTechnical ConsultantCommented:
Set their MX records to mirror yours, you might want to leave their existing MX record and create a new one with a LOWER preference that points to you.

Setting up the Correct DNS Records for your Web or Mail Server
Now if you have any Email filtering appliance in front of you exchange you might need to allow the new domain though.

Assuming you don't, then you need to go into your Exchange config and make you server is authoritative for the new domain.

Then create mailboxes for the new users and set their email addresses accordingly.

To get their legacy mail into Exchange is another matter though! if they are using Microsoft Outlook you you can export the old email and then import it into the new account, but thats a little unwieldy for a large amount of users.



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Pete LongTechnical ConsultantCommented:
To Add a domain in Exchange 2013

Log into Exchange Admin Center  >Mail Flow > Accepted domain  >Add
Give it a sensible name then type in the new domain name and select 'Authorative' > Save

To Add a mailbox for the new domain

Recipients > Add > User Mailbox > New User.
Edit the User > Email Addresses > Add an email address for the new domain
Untick 'Automatically update email addresses based'
Select the new email address as the reply address.
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Pete LongTechnical ConsultantCommented:
Here you go I've written it up for you

Exchange 2016 / 2013 Adding a New Email Domain

sydlegAuthor Commented:
Pete Long thats amazing, thanks for that.

So i have done that now, and i have changed the MX records on the other domain.

Do i need to still create DNS (A) records on my mail server for the new domain ?
Pete LongTechnical ConsultantCommented:

Not usually, no, your Exchange server resolves MX records externally through your DNS but not for domains it is authoritative (why is that so hard to spell!) for :)

Thanks for the inspiration :)

sydlegAuthor Commented:
Receiving an error stating the mail could not be delivered  "because the remote server is misconfigured" 550 relay not permitted ?
Pete LongTechnical ConsultantCommented:

Someone external got that error when sending in from outside?

1. where it you mx record pointed to exchange for an email filter (company or appliance).
2. Ensure your new domain has been made authoritative on your exchange.
3. Restart the Transport service on you exchange.

sydlegAuthor Commented:
I can personally send from the address and it reaches its destination.

but when i try send to that address it bounces back internally and externally (Sending from gmail)
Vikas BhatExperienced IT Infrastructure Services/operations ManagerCommented:
No response
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