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When sending an e-mail from SuperOffice I get one of the error messages:
Error: 550 5.7.60 SMTP; Client does not have permissions to send as this sender or Error: 554 5.7.1 Username doesn't match.
If the popups are blocked on the Chrome, you might get only:
Cannot read property 'getData' of null
Why does it happen and how do I fix it?
SuperOffice Inbox or Pocket, uses the primary e-mail address from your contact card as "From:". The error occurs when SMTP server of your e-mail account, which is configured in SuperOffice Inbox, does not have permission to "Send as" or "On behalf of" your primary e-mail address.
The are two possible solutions to solve this issue:
More information:
FAQ: How to configure email folder names in the SuperOffice Inbox?
Microsoft Documentation: Give mailbox permissions to another user in Office 365 - Admin Help