references being converted to mailto links

2008-03-24 13:12:04
I'm working with a site that recently did an upgrade from version 2.6.10 to version 2.6.16. However, an odd thing happened.

Immediately after the cut-over all messages with a references header had those elements converted to Mailto: links instead of being references to the actually prior messages.

I have looked through the documentation and the archive but nothing I found seems applicable in this case.

Have I overlooked something obvious? Has anyone encountered this before?

Any pointers would be appreciated.

For completeness, no special actions were taken for the conversion. We just installed and started using v2.6.16.