Ping Node: get rid of dropouts mails

[efr]

Still regularly come mails that indicate a failure of Pingnodes. We should get rid of these
Apparently they get more, if the storage is under load.

[Al-S]

You can disable the email notification, or you can check your Ping node connection.

If that ping node get down a lot, then try to make another Ping node, or replace the existing one with another node.