A few years ago, I was involved in a rather noisy and long debate here.
Since then my mailbox has been targeted by an inundation of what appears to be retaliatory/sabotage messages.
As a result, I decided to stay away from the SolidWorks forums. It is a shame, because I admire the company and its products.
The messages in question have a stealth nature and are not easy to block. I found a solution which lasted for a couple years, but the deluge came back with a vengeance.
It took me a lot of time to investigate the issue deeply. See two solutions below.
Due to the fact that all the messages contain a from header @solidworks.com and links to this website, which damage the company's reputation, I would expect SolidWorks corporation to do something about it.
-Ramon F. Herrera
(1) How to block the offending messages using sendmail:
Add the top line (envelop sender) to the access.db file. In my case:
email@example.com ERROR:550 " We don't accept mail from SolidWorks spammers"
(2) How to block the offending messages using spamassassin
Add the following entry to the file user_prefs:
These are the main users who have been sending those messages: