We are currently using Courier to act as an internal smart host to our Exchange server. I am trying to properly setup SPF, but am missing some key element here. I've read through the Courier documentation, but I am a bit lost in the various keywords...
I'm running a Gentoo box, with the Courier portage package. The default /etc/courier/bofh file has the following relevant lines: opt BOFHSPFTRUSTME=1 opt BOFHSPFHELO=pass,neutral,unknown,none,error,softfail,fail opt BOFHSPFFROM=all opt BOFHSPFMAILFROM=all As I understand it, this basically allows unfiltered email to make it's way to our mail server. I'd like to enable SPF to prevent domain spoofing (and just plain junk mail). Could someone please explain the keywords a little better? Thanks, Joey CONFIDENTIALITY NOTICE This electronic mail and the information contained herein are intended for the named recipient only. It may contain confidential, proprietary and/or privileged information. If you have received this electronic mail in error, please do not read any text other than the text of this notice and do not open any attachments. Also, please immediately notify the sender by replying to this electronic mail or by collect call to (262) 796-0925. After notifying the sender as described above, please delete this electronic mail message immediately and purge the item from the deleted items folder (or the equivalent) of your electronic mail system. Thank you.
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