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Unable to send email

Hello,
Unable to send email.
It gives :- smtplib.SMTPSenderRefused: (550, b’From address must match authenticated address’, 'user@privatedomain.com’) .

I had configured the email domain as standard, It is only working for specific one or two users.
And also sometimes emails don’t show up in email queue.
Any assistance would be greatly appreciated.

Thanks

Similar issue reported here as well. Looks like you are not alone.