Emailing invoices should respect the organisational email settings
There is a setting to set the reply email address, however sending an invoice via the api currently doesn't respect this setting, the emailed invoice will still have the user's email address even though the email settings specify a different email address
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Anonymous commented
I agree, currently the email from address is set to messaging-service@post.xero.com and doesn't have the ability to set a friendly Mail From address or even an envelope-sender address.
It seems that the functionality is included if using the Xero Website directly, but when calling via the API it is not possible to set any flag to enable this.