Exchange 2013 and some mail-adresses are not set up in exchange/active directory - how to make exchange send those mails to users via web ?

Hi,

i am trying to get the following to work. We have an Exchange 2013. Most of the mailadresses are for users in our office. But there are a few users that get their adresses by using pop3 of the external Provider.
So the Exchange-Server don´t know the existing of those Mail-Adresses. I think i have to set the accepted domain as "external relay" and not as "authorised domain". But if i do this, it says that i can´t, because the adress is used by
an Adress-policy. I deleted the policy, changed accepted domain to external relay. Now i try to setup the adress-policy with this domain. It says, that this domain isn´t in the list of acceptet domains...


What do i wrong ? All i want is that Exchange sends Mails of known mail-adresses to the mailbox of the user and of unknown mail-adresses to the Mailserver of the domain in the internet.

Thanks in advance...
loosainAsked:
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Manikandan NarayanswamySecurity Specialist & IBM Security GuardiumCommented:
Hi,

Definetly you need to create an accepted domain and set it as external relay. However you cannot create an accepted domain that has a same name configured in remote domain. Therefore i request you to check your remote domain. For your ready reference i am pasting the below link. However i have some few concerns is your external provider share the same SMTP address space if yes then you need to configure Internal Relay

https://technet.microsoft.com/en-us/library/jj657491(v=exchg.150).aspx
https://technet.microsoft.com/en-us/library/jj657737(v=exchg.150).aspx

Thanks
Manikandan
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loosainAuthor Commented:
Set up as internal Domain was the right thing.
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