Help Texts
NickServ ChanServ MemoServSyntax: DEL [channel] {num | list | ALL}
Deletes the specified memo or memos.  You can supply
multiple memo numbers or ranges of numbers instead of a
single number, as in the second example below.
If ALL is given, deletes all of your memos.
Examples:
   DEL 1
      Deletes your first memo.
   DEL 2-5,7-9
      Deletes memos numbered 2 through 5 and 7 through 9.