Can lack of SPF on my server cause rejected mail at destination server?
I've got a client who uses SBC for their ISP and mail sent to thier mailboxes through their domain hosted by us, never gets there. I've checked the maillog to make sure the delivery is successful, and it is.
Would implementation of SPF filters at the receiving mail server by SBC (or any ISP) prevent delivery of mail from my server if I don't have SPF impemented yet?
