Are you sure the message comes from the forum?
Check the email header carefully to see where it really comes from.
The main reason for theese pesky bots to be able to send the emails is that they search the web for email addresses visible on webpages.
And they use Google, Yahoo and other searchers to find the addresses.
Then the bots send these lame, wanky messages about free software, and why you need to buy pills from the blackmarket.
It is becomming more and more impossible to have email addresses openly visible on the web. Some of these bots can also send their messages in unprotected webforms.
There is only one method to handle this problem: Arrest them who spam the internet, and implement enforced sender authentication on SMTP.
So this problem has probably nothing to do with the LDM at all.
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