Basically, I need a webpage can input an id or ids and add it/them to an id list (database) and show the new list in a text area in order of the id. Of course, the ids must be unique. Besides the id input function, id remove function is also need in case the id/ids are mistakenly input or the id/ids no longer exist. All removed ids must be stored in another database (or the same database with a keyword "unblocked" flagged) and shown in another "unblocked" text area for reference purpose.

Finally, we need an email function. As long as there's new id/ids added/removed, an email is sent out to remind all users about the update (id added/removed).

Only registered users can add/remove list and of course receive email alerts. In sum, the web page needs an input and remove function together with an email alert function, and two text areas (one list (or name it blocked list) and another unblocked list). One more thing is a time stamp for the modification. User needs to know the time when the list is last updated. So users know if their own list is up-to-date or not. Sample of a list: "abc, 3egdgr5h, dherfb5, dhfjrejrer4"