In that NIS email protection was completely disabled for the test, it seems unlikely to me that NIS

In that NIS email protection was completely disabled for the test, it seems unlikely to me that NIS is the cause of this attachment in excess of 500 KB problem. I suspect that it's the byproduct of a recent Tbird update. Does anyone know which timeout settings in config editor could impact this problem.

Been using NIS on dozens of computers for years without experiencing the performance issues you're describing, Matt. Norton had a top of the line product that was a resource hog, but not NIS. Don't want to see this thread go off topic but what's your choice for Internet security, Matt.