I just alternated whether someone was in group A or B, because I responded to the e-mails as they came in, at the end of each day. So it wasn't truly random, no

I just alternated whether someone was in group A or B, because I responded to the e-mails as they came in, at the end of each day. So it wasn't truly random, no. On the other hand I didn't control when someone wrote in to me, so arguably it at least wasn't fully in my control. Of course, it wasn't double-blind because I was both writing the e-mails and conducting the experiment too.