Thanks Mark. So far, so good. I used this Linode tutorial <https://www.linode.com/docs/email/postfix/configure-spf-and-dkim-in-postfix-on-debian-8> in addition to the DO one you mentioned, so that I had two views of the process.
Now to look at your spamprobe setup. Peter -- View this message in context: http://postfix.1071664.n5.nabble.com/What-is-the-best-anti-spam-and-anti-virus-combos-for-Postfix-tp90210p90369.html Sent from the Postfix Users mailing list archive at Nabble.com.