Some accounting software vendors like Exact Online and Admisol require you to explicitly confirm the email addresses from which invoices will be sent to the accounting software. We also call this 'whitelisting'.
The e-mail address that you must provide in that case is firstname.lastname@example.org.
White listing in Exact Online
More about this in their article on troubleshooting the digital postbox of Exact.
White listing in Admisol
Go to 'Files' > 'Contacts'
Press the Plus-sign.
Add a new contact 'Noreply OkiOki' with the email address 'email@example.com'.
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