Emails with valid email address get soft bounced with this error: Local address contains control or whitespace.
This error means that the email has a space somewhere in the the From email address or there was a comma or extra character in the From line. If you do not see a space inside the email address, check the end of the address to see if a space somehow got added at the end.
The email send did not occur due to the error with the address. The emails will need to be resent once after the associated address is corrected with white spaces or extra characters.