Send LDF messages to a dedicated e-mail address, not your own or admin e-mail. Mine is simply
fw@mydomain.net. Have it set to check silently in your mail program (mark as read, do not notify). Skim it occasionally (daily/weekly) or have rules set up to inform you of more unusual activity. But all those basic attacks, you can generally ignore.
But one piece of advice that has given me a lot of peace: don't run SSH on port 22 or 2222. Both of those ports are constantly scanned and brute force attacked, esp. by FritzFrog and others. So if you run on an alternate port, you will indeed a measure of "security through obscurity."