Announcement list

How can I know if the hole list that I write in a mail account, received the announcement by the announcement list service?

You can’t. We keep track of bounces internally, and addresses that bounce the announcements repeatedly will be removed from your list, but there’s no way for us to guarantee that the email is actually being received. (There are any number of things that could silently keep it from its destination, like spam filters.)

If you send out html email could you set a cookie?

Email has a header for requesting a read receipt, but AFAIK, it’s not well honored by most email user agents.

Or at worst case, grovel the server logs for the IP address of whoever slurped a particular image off your server. While this would not get you the actual address, you could get counts on how many people actually opened your email.