I have the need to send email as a different user. My main email is email@example.com, however I need to send email as firstname.lastname@example.org
I have incoming email working...if I send to email@example.com or firstname.lastname@example.org, the email shows up in Outlook and all is well (Outlook 2016)
However, if I compose a new email, change the "From" to email@example.com and hit send, I get a bounce
This message could not be sent. Try sending the message again later, or contact your network administrator. You do not have the permission to send the message on behalf of the specified user. Error is [0x80070005-0x0004dc-0x000524].
Searching on Google indicates that I need to allow permission to do this in Exchange, but always seems to point to the fact that I need to allow permissions to another user...but since that user is me and doesn't have a separate account, I don't understand how to make that work.
That is how Exchange is designed to work. As far as Exchange is concerned you have one email address - the default. Any other addresses are aliases which are for inbound email only. You cannot pick and choose the address.
You have a number of options depending on whether you are the server admin.
As an end user, option 3 is the only one available to you. If you are the admin of the server then option 2 is the best available.
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