We had the same experience when setting our SPF records to FAIL ("-all"). It turned out many more people than we expected forwarded our messages and had spam-f

We had the same experience when setting our SPF records to FAIL ("-all"). It turned out many more people than we expected forwarded our messages and had spam-flagging problems as a result. I'm curious if anyone who uses SOFTFAIL ("~all") can comment on how well it works? I see it in wide use now despite warnings that it's not appropriate for production use. Curiously, Microsoft's SenderID wizard calls the SOFTFAIL level "Discouraged" (meaning, mail from non-matching domains is discouraged) with no mention of its intended use for debugging.