One of your filters uses a custom header that contains an invalid character, such as ':', a non-printable character, a non-ascii character, or an eight-bit ascii character. Please edit the msgFilterRules.dat file, which contains your filters, to remove invalid characters from your custom headers.
One of your filters uses a custom header that contains an invalid character, such as ‘:’, a non-printable character, a non-ASCII character, or an eight-bit ASCII character. Please edit the msgFilterRules.dat file, which contains your filters, to remove invalid characters from your custom headers.