My newly installed Domino servers started crashing after I enabled the new TNEF conversion feature on both of them. Going through the NSD files of the crashes, it seems obvious that the TNEF conversion is the problem here. I have to admit that I didn't actually think these servers received very many TNEF files, if any at all. I never get any, and I've never had any questions about it from any of my Notes or DWA users. Being only about 30 - 35 users, I didn't think it totally impossible that we didn't receive any TNEF files at all.
Obviously I was wrong! I do have several users using Outlook over POP3 to get to their mail, and they wouldn't complain about the TNEF files, now would they?
What I had in mind when I activated it was to send some TNEF emails to myself for testing purposes.
The TNEF conversion was quickly disabled on both servers, and operation retuned to normal again.
If anyone has any insights as to why this would happen, you are welcome to leave a comment.