Re: [exim] Outlook confuses EXIM + SA

Matthew Byng-Maddick wrote:
>
> You need one of To:, Cc: or Bcc: as well.

Nope.

From RFC 2822, section 3.6:
>
> The only required header fields are the origination date field and
> the originator address field(s). All other header fields are
> syntactically optional. More information is contained in the table
> following this definition.

Further down in section 3.6.3, it describes how the sending MTU must
remove the BCC header from outgoing messages, so if a message only has
BCC recipients, the resulting message will have none of the address
headers in it.

- Marc