Send from address in Exchange on Office 365

We have 1 user in our organisation that uses exchange. We have set up an office 365 exchange account using exch.domainname for the DNS but need to have @domainname as the send from address. How can we do that?
suromaAsked:
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VirastaRUC Tech Consultant Commented:
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Vasil Michev (MVP)Commented:
In order to be able to send from a specific address, it needs to be the PRIMARY SMTP address for the user. So, simply make the @domain.com one primary.

Alternatively, you can use one of the available workarounds, if changing the primary SMTP address is not an option just let us know so we can describe them :)
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Adam BrownSr Solutions ArchitectCommented:
Can you clarify what you mean? Do you mean you have a user that needs to be able to send from two email different email addresses in Office 365? If that's the case, you would need to create a separate mailbox or a distribution group that has the email address you need and then set his mailbox to have send as permission on that second mailbox/distribution group.
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suromaAuthor Commented:
We have set up the domain we needed now and can send out from this domain. But how do we get email back to it?

We need something like this - imap server that all the other users are on forwards email that  arrives there for user1@domainname to user1@domainnme.onmicrosoft.com and this appears in the user1@domainname account we have also set up in Exchange online.

Hope that makes sense. Cheers.
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suromaAuthor Commented:
OK we have know understood the adding SMTP address. That is now done in exchange admin center --> edit mailboxes --> email address and we can send and receive to user1@domainname as the imap forwards to user1@domainnme.onmicrosoft.com.

Next question is how do we login to outlook web app as user1@domainname rather than user1@domainnme.onmicrosoft.com?

Thanks
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suromaAuthor Commented:
OK got that sorted now. Trying to work out how to import all email from another hosted exchange solution. Can anyone help there?
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suromaAuthor Commented:
Thanks for your help, managed to get sorted eventually.
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