
Originally Posted by
pkvogt
With Lion, they work only intermittently: some of the messages in the inbox are colored, others from the same sender are not. Same problem and three different machines. The mail account is IMAP. If colored messages are moved to a different mailbox, the coloring may or may not be retained. Apple advisors were unable to solve this problem. At the end, they blamed it on Spamsieve, yet the problem persists even if Spamsieve is turned off.
I don’t think SpamSieve does anything that would cause this, but you can tell for sure by unchecking the SpamSieve rule in Mail’s preferences and removing SpamSieve’s plug-in:
/Users/<username>/Library/Mail/Bundles/SpamSieve.mailbundle
That will fully remove any effects from SpamSieve. There’s no need to reinstall Mail or archive your mailboxes.