1.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid
The score for this rule should be a zero or a near-zero. There must be some problem with assigning a score to such test rule (the 1.0 is a default value if a score line is missing).
T_DKIM_INVALID is a test rule, as such its score should be 0.01 by default. Make sure the sa-update has provided an up-to-date version of rules. Mark
