We recently migrated to Office365 and I configured SDPOnDemand mail settings for a "Shared Mailbox" as recommended in previous topics with no avail. I created receive connector with all the SDPOnDemand IP Addresses and yet not working. After alot of troubleshooting, I switched the mailbox into a regular mailbox and it worked. Regular mailbox requires a license while a shared mailbox doesn't, so can you please let us know how to make the settings work for a shared mailbox. We have other helpdesk tools that use the exchange protocol rather than SMTP and this works. 

Please advise.

Thank you and Kind Regards,

Muhammad Haddad