Nearly any topic related to swimming is welcome. Chances are that there's someone else at the same stage in swimming that you are. The best way someone can give advice on technique is to actually see how you swim, and then make suggestions based on that observation. However current technology doesn't enable us to get such a nice picture. So the more you can describe about your particular problem, the easier it is for others to offer helpful suggestions.
Large messages can be hard on system traffic as well as causing problems with some newsreaders.
However, if you feel you want to provide information a relevant product. Money Fast chain letter, various sex phone line advertisements, and political action fund solicitation letters. It is not a good idea to post replies to spams. All that does is create junk messages in what can be dozens of newsgroups. If you feel that someone has insulted you, walk away from the computer for a minute, and then reread the message.