Invalid bcc recipients, why? I checked grammar and and not sending from a list, just entering names on forwarded mail.
Can you please send us full text (or screenshot) of error message you get or send me the problematic email with more information about the account and recipients (and reference to this topic) to firstname.lastname@example.org ?
You should try to send the email without blank recipients.
Thank you - this resolves the problem. This was not an issue with Windows Live Mail. I will be careful about this now. Thanks for the speedy resolution!