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Sending emails from Office 365 aliasLukas Beran
You can have unlimited number of aliases created for your Office 365 account (mailbox). But unfortunately you can’t send emails from the aliases. In the following article you can find the trick how to send emails from Office 365 alias.
You need to add another POP3 account to your Outlook. This account will have address of the alias, but will be used only for sending emails from the alias.
In Outlook, click on File – Add Account and choose Manual setup or additional server types and click Next.
On the next page select POP or IMAP and again click Next.
Now you are on the page where you fill in email address (address of the alias), incoming mail server (127.0.0.1), outgoing mail server (smtp.office365.com) and User Name and Password for your primary Office 365 account. And uncheck Automatically test account settings when Next is clicked.
Now click on More Settings and on the tab Outgoing Server check My outgoing server (SMTP) requires authentication.
On the tab Advanced change SMTP encryption to TLS and set port 587.
Confirm the process (Ok, Next, Finish).
Now you can use this account for sending emails from the alias.
Now go to Account Settings and selected your alias and click Change Folder. In the new windows, select Inbox of your primary account and click Ok Now you released the data file of your alias, but the account is still visible in the left list of accounts. Go to the Account Settings again switch to Data Files tab and delete the files of your alias. Now the account disappeared from the list of accounts, but you can send emails from this account.
The last thing is stopping Outlook downloading new emails from this account (which is not used for emails). Switch to Send / Receive tab in Outlook and click on Send/Receive Groups and Define Send/Receive Groups. Now click Edit and uncheck alias account.