In fact, I am unable to send group emails regardless of my trust level, whether it’s trust_level_0, trust_level_1, trust_level_2, trust_level_3, or trust_level_4. Among them, trust_level_4 has no members. Trust_level_3 only includes me and one administrator, totaling two people.
Now I’m very frustrated. I can’t send mass emails. Of course, I’ve adopted another method, which is to export a table of all users, copy everyone’s IDs, and then import them into the email recipient field.
But doing it this way means everyone can see that many people are receiving the email. I don’t want anyone to be able to see other recipients. This is because my users are Japanese. They are very superstitious about this. Even if the ID they used was randomly chosen.