Philip Guenther writes:
Because doing so in SMTP is impossible without unstandardized extensions. (How is the server supposed to indicate that a message is being rejected for rcpt A but not rcpt B?)
MAIL FROM:<tim@xxxxxxxxxxx>
250 OK
RCPT TO:<guenther@xxxxxxxxxxx>
if envelope :all :is "from" "tim@xxxxxxxxxxx" {
reject;
}
550 I reject mail from tim@xxxxxxxxxxx
Arnt