>> I believe you can't send a valid RFC 822 message with no TO recipient and
>> only BCC recipients. But I'm not sure of that.

>From RFC 822:

> A.3.1.  Minimum required
> 
>    Date:     26 Aug 76 1429 EDT        Date:     26 Aug 76 1429 EDT
>    From:     [EMAIL PROTECTED]   or   From:     [EMAIL PROTECTED]
>    Bcc:                                To:       [EMAIL PROTECTED]
> 
>       Note that the "Bcc" field may be empty, while the  "To"  field
>       is required to have at least one address.

> C.3.4.  DESTINATION
> 
>       A message must contain at least one destination address field.
>       "To" and "CC" are required to contain at least one address.

This seeming contradiction (1) is why some servers require a To or CC
recipient and some servers do not.


In theory, the mail client software could attempt to simply add a blank BCC
header; however, in practice, this hardly ever works.

mikel


(1) It's not really a contradiction.  Within RFC 822, it's the Backus-Naur
Form (BNF) meta-language definition that constitutes the "one true
definition" of the standard.  And that makes it perfectly clear that Section
C.3.4 of the standard might better have read something like this:

> C.3.4.  DESTINATION
> 
> A message must contain at least one destination address field (i.e. "To",
> "CC", "Bcc"). "To" and "CC" are required to contain at least one address,
> whereas "Bcc" may contain zero or more addresses.

Of course, it's easy to say how things might have been made better 25 years
after the fact. ;-)


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