Need to set up the mail relay to allow seperate email addresses in office 365

I have been on office 365 for awhile now and I have had all the networks printers sending scanned docs out using a service account that has a mailbox on in the office 365 envirorment. I am now being asked if we can set up other LOB systems to use this SMTP relay, but have the email come from different addresses, and not the standard SMTP service email account. I have read multiple articles on how this can be done but none seem to be working. Was hoping someone has some success in getting this working. My 365 environment is upgraded, I do not have a local exchange server, and I am federated and running dirsync and ADFS. Any help would be great!
Kelly-BradyAsked:
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Adam BrownSenior Systems AdminCommented:
You should be able to accomplish what you want by creating a Shared mailbox or Resource mailbox for with the LOB address they want, then grant full and send as permissions to the SMTP relay account's mailbox. If you do that, you would be able to configure the LOB accounts to use the credentials of the SMTP relay account to access Exchange, then send email as the LOB address.

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Kelly-BradyAuthor Commented:
That is exactly what I had to do but since I am federated I had to add a few steps. I Created a user in Active Directory then waited for it to replicate out to Office 365. I then assigned it a E3 license and gave send as permission on this box to the SMTP relay account. Once I verified that it was sending mail out as the LOB user, I converted the mailbox to a shared mailbox to free up the license. Thank you for getting back to me.
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