We continue evaluating several alternatives to provide full email customization. We are actively working on an alternative.
Unfortunately we do no yet have an ETA.Fred C commented
Companies today are fighting the battle of email spoofing and phishing campaigns. These malware emails result in lost productivity and sales and decrease customer confidence when they see an email come from someone different that our company. We need to have the ability to modify the from (sender) email domain as our own. Yes...its true, folks out there will ignore or interpret an email coming from ***.onmicrosoft.com as 'phishing'.