Mail.app exception raised

Question

I am getting the following error. It seems to happen when rules are applied. I complete rebuild my Rules and it is still happening. I even have the Junk Mail disabled. I am connecting to a Leopard Server.
Anyone see this before? It makes Mail unusable.
Apr 29 13:39:28 xxxxx Mail[603]: * -[MimeBody stringValueForJunkEvaluation:]: unrecognized selector sent to instance 0x697f6b0
Apr 29 13:39:28 xxxxx Mail[603]: exception raised in routeMessages: * -[MimeBody stringValueForJunkEvaluation:]: unrecognized selector sent to instance 0x697f6b0

Answer 1

Hola Jaime.
This problem in Mail is usually caused by some Launch Services cache or preferences corruption. The following article describes how to manually reset Launch Services -- the notes at the bottom of the article also provide information about the side effects of deleting each of the files involved:
Resetting Launch Services
If you prefer using a cache cleaning utility instead of following the manual procedure described in the previous article, this other article provides links to some utilities that can be used for troubleshooting and cache cleaning:
Resolving Disk, Permission, and Cache Corruption
It seems that the most appropriate utility for solving this particular problem is Tiger Cache Cleaner, but you may also want to consider other utilities, such as OnyX, or Cache Out X, which are free. Whatever utility you choose, be sure to read this first:
Side effects of System cache cleaning
As an example, this is how you should proceed with OnyX:
1. Quit all applications.
2. Launch OnyX and enter your administrator password.
3. Click Maintenance. In the Reset section, check LaunchServices database.
4. You may uncheck any other pre-checked options if you wish.
5. Click the Execute button.
6. Restart the computer.