My post in the previous topic almost certainly has the answer to your query:
http://support.nabble.com/User-mailing-list-emails-blocked-SPF-tp7596457p7596459.htmlalthough it does then start to wander away from your particular issue.
Further, Csound has a number of different mailing lists archived by Nabble each of which is held in a different sub-forum at Nabble.
You need to make sure that you are subscribed to the appropriate list and that you are attempting to post in the matching sub-forum. You'll find more details about subscribing to the lists using the "more options" link on each sub-forum where one of the lists is archived.
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.