[sylpheed:37314] Re: Email standard for BCC behaviour

[Paul]

On Thu, 25 Jul 2024 08:52:48 -0600
"Gene Goldenfeld" <genegold at fastmail.com> wrote: 

> So this is determined by the sender’s program, e.g., Sylpheed and Gmail,
> and not the recipients’?

No, it's the server's job. The MUA sets the Bcc header, the MTA deals with it.
A server that reveals the Bcc header to any recipient is a broken server.

The 'B' stands for 'blind', it's called blind for a reason.

There's no mystery to this, it's really simple to grasp, no recipient should
see the Bcc header or its contents.

with regards

Paul