How to add a second mailboc to Outlook 2016 ?

How to add a second mailboc to Outlook 2016 or Office 365 ?

I have my main account and  2nd mailbox added where I can sent from.
When I sent a mail from my 2nd to my main account it goes trough.
But the mail is located under sent items of my main account not on the 2nd account....

How to add a full mailbox correctly ?
Eprs_AdminSystem ArchitectAsked:
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SoHandyCommented:
To enable or disable it in the Office 365 admin portal:

Login into Office 365 Admin portal
Expand Groups and select Shared mailboxes
Double click on the shared mailbox you want to change
how to change the sent items behavior
Click Edit at the right of the Sent items row
Change the settings then Save and close the dialog.
change sent items behavior
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Sam Simon NasserIT Support ProfessionalCommented:
when you compose a message, you have the option from which account you want to send
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Eprs_AdminSystem ArchitectAuthor Commented:
Hi Michael, I have checked your article , thanks. But its not gonna work :-(
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Eprs_AdminSystem ArchitectAuthor Commented:
Hi SOHANDY,
we have no shared mailboxes, I spoke about user mailboxes. :-(
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Eprs_AdminSystem ArchitectAuthor Commented:
Hi Sam,
I know about the function to send from another account... :-)
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Eprs_AdminSystem ArchitectAuthor Commented:
I have found the solution. :-)
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SoHandyCommented:
all good Eprs, misread it.  what was your solution?
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Sam Simon NasserIT Support ProfessionalCommented:
ya what was the solution?
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Eprs_AdminSystem ArchitectAuthor Commented:
Hi Experts,

I added the account here.

2nd account
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Eprs_AdminSystem ArchitectAuthor Commented:
In the meantime I have found the solution my self.
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