For many years, users of SharePoint have enjoyed a handy feature known as “Incoming Email”. This feature allows for assigning email addresses to SharePoint lists. Emails sent to the assigned email address will process to the list associated to that email address. However, as organizations begin to migrate to Office 365 they are left with the dilemma of whether to seek alternatives or abandon this functionality all together. Why you ask? This is because the incoming email feature is no longer available in SharePoint Online out of the box.
below shows one of the reasons why this feature does not work in SharePoint Online