when I first tried to register for this forum, I was puzzled as to why the registration mails did not arrive. I had to use a very old mail address I still had from my university to get the registration working.
After some investigating, I found out that the mail server this forum uses is configured incorrectly:
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HELO and hostname differ, and this is regarded by many mail servers as a sign of spam emails.
So my advice to the admins of this forum is to correct this.
Also, I noticed that this forum does not use https, which seems a strangely outdated choice in 2018. Maybe you want to correct this as well, while you are at it.