I tried replying to the 'whats this material' thread about four times yeste= rday and each message was bounced. It seemed to be something strange at MIT= as it was them bouncing the message. Can provide the full bounce message if anyone wants it. -----Original Message----- From: piclist-bounces@mit.edu On Behalf Of James = Cameron Sent: 15 February 2019 03:59 To: piclist@mit.edu Subject: [OT] Mailing list posting problems I've twice replied but my posts haven't reached the archive, the bounce mes= sage says; .... while talking to mit-edu.mail.protection.outlook.com.: >>> DATA <<< 550 5.7.64 Relay Access Denied ATTR36. For more details please refer to https://support.microsoft.com/kb/3169958 [MWHPR01MB3215.prod.exchangelabs.c= om] [DM5PR0102CA0032.prod.exchangelabs.com] [DM3NAM03FT028.eop-NAM03.prod.protection.outlook.com] 554 5.0.0 Service unavailable The URL didn't help. ;-) -- James Cameron http://quozl.netrek.org/ -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/chang= e your membership options at http://mailman.mit.edu/mailman/listinfo/piclis= t --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .