I am not seeing the same behavior. I was able to send responses without issue when there was a trailing semicolon in both the To: and Bcc: fields. There should not be more than one email address in the From: field as this is not support by most SMTP servers.
This may be an issue that is better handled by the support team; we may need to request information that you do not want displayed on a public forum (for example, the actual email addresses you are experiencing a problem with). I would suggest opening a support ticket and referencing this post in it.
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