[sylpheed:37313] Re: Email standard for BCC behaviour

Steve O'Hara-Smith on RFC 5322:

> It means that if you reply then your mail program is
> allowed to include the BCC that came in the original
> rather than having to filter it out or pay attention to
> its contents. It essentially assigns responsibillity for
> the Bcc: field and its contents to the sender and not the
> replier.

Yes, and the sender is probably the SMTP server, not the
mail client.