Thunderbird Version 115.9.0 I have been using Message filters for many years without a problem. Recently my email provider, Cox, switched all email to Yahoo. The emails remained the same but had to change to Yahoo servers. All of this works fine receiving and sending emails. The only thing I notice is the emails download slower. The Filters now do not work all the time, I run them manually and some still don't work. If I go to the filter and click edit, don't change anything and exit and then run it manually it's works but doesn't work the next time. I wait until all email is downloaded and then manually run the filters, some work and some don't all the time. Thanks for any help. Ray Mulkey, Ray.Mulkey@cox.net.