Re:After self-hosting my email for twenty-three years I have...
by jeffbee on Sunday September 04, 2022 @04:05PM
(#32717159)
There is no such thing as a BCC header. That's the entire point of the BCC.
What you've described might be correct in some cases but is not universal. The mainstream way that messages are sent is your "email client" or MUA speaks the ESTMP protocol to a mail transfer or submission agent (MTA or MSA). The client directly specifies the envelope recipients, which are not, generally speaking, parsed out of the formatted message. That is why it is possible for me to send a message to myself but the message is subsequently delivered to hundreds of unnamed recipients.
What you've described might be correct in some cases but is not universal. The mainstream way that messages are sent is your "email client" or MUA speaks the ESTMP protocol to a mail transfer or submission agent (MTA or MSA). The client directly specifies the envelope recipients, which are not, generally speaking, parsed out of the formatted message. That is why it is possible for me to send a message to myself but the message is subsequently delivered to hundreds of unnamed recipients.