Although Almabase's AI says that emojis are permitted in Almabase email subject lines, I found that trying to place them there is not successful -- when I tried to place a color emoji there, a test indicated that the emoji had turned black-and-white and was different from what I had entered.

As with inserting merge fields in subject lines, it should be easier (and the results more reliable) to add these. It's done in many bulk email senders, and it shouldn't be hard to have it implemented here.