What are you missing, about 18 posts (you have to have 20 posts), sorry I couldn't help myself.
- The problem comes from drive by spammers, who having registered put objectionable or commercial links in their profile signature to try and gain link promotion, etc.
There have also been cases of the PM function being abused to spam forum members, so you will notice that you can't use the PM function either.
Unfortunately because of the actions of others legitimate members suffer by the actions to prevent this spamming.
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The default setting in the forum is that you should get an email notification of replies to topics you create or contribute, so you should get one for this.