I don't know why people do 'test' posts. There are three reasons why people's posts bounce:
1. You use an account other than the one subscribed to 313 to try and post. 2. You write something using a short list of US English profanity, the name of a prominent auction website, and the names of a couple of people who were banished forever from 313 years back. 3. You send message in any format other than good old 1976-vintage old school plain text. Multipart Mime gets bounced. No you can't use 64-point fuschia banner texts in your post, just 8-bit ASCII. Ümläüts, Tilde and Àccènt Grave are A-OK.