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How to create an alternative email address or email alias for your primary email account in Office365 Business Essentials (2016)
Sign in to your Office365 account.
Go the Office365 Admin Center page.
On the left hand side toolbar select the Admin centers option at the bottom and choose Exchange
You are now in the Exchange Admin Centre
Select recipients > mailboxes
Select required User under Display Name
Double click the user name to edit
In the new pop up window select email address on the left
Then click the + symbol to add an alias email address
You can add many types of email type, in this case use SMTP unless you are familiar with the other types and know what you require
Enter your desired email address in the *Email address field
If you select the Make this the Reply address checkbox, this email alias will become the default reply to address for your account
You can add, change, or delete an email address associated with the user. The user’s primary email address is displayed in bold type, but they’ll received email sent to any address in this list.