I am the administrator of a group and today when I looked at the subscribers' list I noticed that a subscriber next to his e-mail address has the letters IL on a fuchsia background, while another who has never participated in the Mailing List has the letters B on a fuchsia background.

What are the meanings of these two letters?

Please note, for information, that both members have never posted on the mailing list

Is it possible to restore the normal registration of both subscribers ?