Difference between sending through DNS or through ISP
Posted on 2008-06-20
When setting up Exchange 2003 one is asked whether ione wants to send through DNS or through an ISP's mailserver. It is recommended to choose DNS. I did so but soon found out that many mails were blocked because they were considered spam. Apparently an MX-record was missing. I changed back to ISP and it works now, but can someone please explain what the advantage is of DNS above ISP and what the MX record should contain?