On Feb 16, 4:06 pm, "Hal Hostetler [MVP P/I]" wrote:
Try adding the "And stop processing more rules" directive to the rule.
Without this directive, all the rules you have will be run against a given
message which could be causing the problem.

Thank you, unfortunately your suggestion does not work. In any case,
I test this by "run it now", I run only that rule on all the messages
that were not forwarded to see if they get forwarded, so no other
rules are involved in testing.