After reviewing my maillog i see some mail being sent with a from
address of "from=<>". How can I configure either the sendmail.cf or
access file to refect email being sent or i guess recieved header with
a from address that is null like this? thanks for any insight you can
give.

Philip wrote:
> After reviewing my maillog i see some mail being sent with a from
> address of "from=<>". How can I configure either the sendmail.cf or
> access file to refect email being sent or i guess recieved header with
> a from address that is null like this? thanks for any insight you can
> give.
>
I think it's better to accept (and read) those messages.

<quote from RFC2821.txt>

6.1 Reliable Delivery and Replies by Email

When the receiver-SMTP accepts a piece of mail (by sending a "250 OK"
message in response to DATA), it is accepting responsibility for
delivering or relaying the message. It must take this responsibility
seriously. It MUST NOT lose the message for frivolous reasons, such
as because the host later crashes or because of a predictable
resource shortage.

If there is a delivery failure after acceptance of a message, the
receiver-SMTP MUST formulate and mail a notification message. This
notification MUST be sent using a null ("<>") reverse path in the
envelope. The recipient of this notification MUST be the address
from the envelope return path (or the Return-Path: line). However,
if this address is null ("<>"), the receiver-SMTP MUST NOT send a
notification.

</quote>