Everything Mailing Address Registry

Have you used the EMAR before?

I am currently on the EMAR and use it frequently.
I am not on the EMAR, but I sometimes mail to people on it.
I have been on the EMAR in the past but am not on it now.
I like mailing with noders, but the EMAR is too public and open.
I would be on the EMAR, but I have security concerns.
I don't know what the EMAR is.