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!