Exchange recipient policy

I would like tio understand when someone creates some email address through recipient Policy, if those suffixes need to be registred on external DNS or not.

example:

our main domain name is  Mycompany.com.
if we want to add : @local , @Dept1.com,@dept2.com,@dept3.com

do we have to register those names with the external DNS?

thanks
jskfanAsked:
Who is Participating?
 
SembeeCommented:
They must be registered in DNS if they are receiving external email on the addresses.
You can't receive email on them otherwise.

Simon.
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amaheshwariCommented:
If you will add other email addresses then you will be able to send recive on those addresses internally (if they are not registered and added as secondary addresses through recipient policy on user's mailbox).But no one can send from external domain to that secondary email address because that Domain is not registered.
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jskfanAuthor Commented:
-from external domain , no one can send to these email address. so do they have to be
registred in external DNS?

but they can send from those email adresses to internal and external domains. correct?

there is @local  it's not @local.com just @local, I don't understand why they use it in the company. do you have any idea?




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SembeeCommented:
The only reason I can see for using those additional domains is for internal use only. They will be useless to send email outside because no one would be able to reply to those addresses.

Perhaps it has been done so that users can enter

jim@accounts
bob@sales

instead of the full email address or looking through the GAL.

Which is an interesting technique that I haven't seen before.
As long as it isn't the default domain on any account then I can't see that it would do any harm.

Simon.
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jskfanAuthor Commented:
1- users send external email and receive from external domains for the following addresses:
@Dept1.com,@dept2.com,@dept3.com

my questions is do those addresses need to be registred in the external DNS?

2- as for @local,  I don't know why they use it.

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jskfanAuthor Commented:
what about this:
2- as for @local,  I don't know why they use it.

do you have any idea?

thanks
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SembeeCommented:
No idea. Unless the internal windows domain has been called "local".

Simon.
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