In your account settings, choose to add a new account and select to configure it manually.This usually isnвЂ™t a problem internally but might be blocked for you when you are outside your corporate network and also when you are using a Microsoft 365 Exchange Online mailbox, SMTP access could be limited. The important part is the SMTP access to your Exchange server. Outlook workaround 1: POP3 dummy accountДЇor this workaround, POP3 doesnвЂ™t actually have to be enabled for your account as weвЂ™ll disable receiving emails for the POP3 account anyway. Note: If the From field isnвЂ™t visible for you, while composing a new message, select the Options tab on the Ribbon to enable it. This would allow you to create Message Rules for your aliases as well (for instance to move them to a different folder). When (external) recipients send you an email via this alias, you will also still see that address in the To or Cc line. Once this parameter is set, you can specify any of your aliases in the From field and this address would be maintained in the From field for all (external) recipients.

Set-OrganizationConfig вЂ“SendFromAliasEnabled $true If your mailbox is hosted in Microsoft 365 Exchange Online, you can request your Exchange administrator to set the SendFromAliasEnabled parameter via PowerShell for Exchange Online. When your administrator hasnвЂ™t set this option or when your mailbox is hosted in an on-premises Exchange environment, there are still several Outlook and Exchange level workarounds to achieve this which are discussed below as well. However, when your mailbox is hosted in Exchange Online, your Exchange administrator can set an option to allow you to specify any of your addresses as the outgoing address. How can I send out a message with one of my mailbox aliases?ДЇor the longest time, there was no native way to choose which one of your Exchange mailbox addresses (or aliases) to use when sending out an email The outgoing address that will be used will be the address that has been set as the вЂњReply addressвЂќ for your user account by your Exchange administrator. I've tried setting the From field with another address but that got automatically replaced with my default address or a bounce message saying that I don't have permission to do so. I can receive mail sent to any of these addresses just fine, but I cannot find a way to choose which address to send out with. I've got a single Exchange mailbox which holds multiple email addresses.

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