There is no Bcc header (it is defined in the RFC for Internet
Messaging Format but hasn't been included for a couple decades). The
"headers" in Outlook are just input fields. It's part of the UI.
They are not used to route e-mails. The e-mail client compiles an
aggregate of all e-mail addresses and sends a RCPT-TO command for each
one which is then followed by one DATA command for the message (which
includes the *fields*, aka headers, added by the e-mail client, a
blank line as a delimiter, and the body of the message). All those
"headers" are just data within the content of the message (and why
spammers can put anything they want in there since it is all data sent
in the DATA command). So for 20 recipients, the sender's e-mail
client sends 20 RCPT-TO commands to their mail server and then 1 DATA
command. The mail server never gets the content of the To, Cc, or Bcc
*fields* in the UI for the e-mail client.
If a Bcc "header" is being shown in the received e-mail then the
sending e-mail client put it in the *data* of their message. Outlook
never includes the content of the Bcc *field* in its UI in the *data*
of the message. Maybe the sender used some other e-mail client and
has it misconfigured or deliberately added the "Bcc:" line into the
*data* of the message. Maybe a plug-in to Outlook is screwing up.
My user is the sender of the message and is looking at the message they sent
in their Sent Items folder in Outlook. It is here that for some of their
previously sent messages where the BCC field was used, to they see the list
of recipients vs others they do not even see the BCC field at all.
>
> Thanks for the details! I apologize for not being clear.
>
> My user is the sender of the message and is looking at the message
> they sent
> in their Sent Items folder in Outlook. It is here that for some of
> their
> previously sent messages where the BCC field was used, to they see
> the list
> of recipients vs others they do not even see the BCC field at all.
The user must open the mail item in its own window (double-click on
the message). Then the Bcc field, if it was used, is shown. If the
"View -> Bcc Field" menu entry is disabled, the Bcc field was not
used.
Thanks for your persistence....
Maybe Microsoft broke something in a version later than 2002 that I
still use (no bang-for-the-buck for me to bother with later versions).
You didn't mention which version of Outlook the problem is exhibited.
If disabling all add-ons and plug-ins doesn't help, or running Outlook
in its safe mode ("outlook.exe /safe") doesn't help, try using the
Help -> Detect and Repair menu.
When I mentioned opening the suspect mail item (that supposedly used
the Bcc field when that message got sent), simply selecting the
message to view it in the Preview pane will not show the Bcc field.
You have to *open* the mail item in its own window (and perhaps use
View -> Bcc), not preview it in a pane, to see the Bcc field if it was
used when the message was sent.
So when you resend a mail that prepopulates the Bcc field, is the Bcc
field missing from the *view* window when that mail is *opened*?
Are you using the embedded editor in Outlook when composing new mails?
Or do you have Outlook configured to use Word as the new e-mail
editor?
Any forms or templates being used? If so, tried sending without them?