On Sat, 24 Oct 2020 10:51:14 -0500 Ramon F Herrera wrote:
> ... I have found > two important items. One relates to sendmail... > > (1) My first line of defense is the access.db sendmail file. It turns > out that the only header that is actually inspected is the top line, > which begins with "From " (envelop sender). I don't know sendmail, but I presume that's acting on the sender address given in the [E]SMTP "MAIL FROM:", which isn't a header. At the time that's received the MTA hasn't yet received any headers.
