How could I do with a trigger so that emails without subject are answered by an email saying that they must fill in this field, is that if I make a trigger with CONDITION - TITLE = NULL or - it does not work well, since Zammad defaults to Post without subject puts the character -.
Also taking into account that a Subject such as “hello - hello” should not be considered an empty matter for example.
I tried with regular expressions but there is no way.