Cron sends no mail to MAILTO address

When you are using cron to do some automatic jobs and want the output to be mailed, be sure you are entering the mail address in the right format. In this case it means that the mail address must not contain an „_“ (underscore)! If you enter into the MAILTO env of the crontab a mail address which contains an underscore you’ll wait forever 😉
Of course this behavior depends of your cron version …

So don’t use an underscore when ever you are able to do.