A forum is like any other website, and all the posts are liable to end up being indexed by the
search engines. So be careful in writing your message, do not disclose items that you want to keep to a restricted circle, and pay attention to spelling, nobody likes reading things written slovenly, or incomprehensible. If you write a message today, the chances are that in 6-8 weeks, that post will have been indexed by the king of search tools, Google. That means that people will keep reading what you've had
to say for months and years to come, even when this forum is no more online, since Google but also other search engines will store it in their cache.
Therefore, if by posting your aim is to connect with relatives or find more information on any topic, if your email has changed 1-2 years from now, you will never be able to know if the reply to your posting arrived. It is good practice to avoid this to add at bottom of the message a kind of signature, like your name and surname and at least the city where you live, so that someone who - anywhere in the world, any time in future years - wants to contact you, will find a way.