recently, there is new Joomla! update to version 3.4.1. I noticed this and was waiting for email from my sites. But no comes. I checked the settings and everything seems Ok. If I manually change the 'atoolsjupdatecheck_lastrun' value to be far in past, email is send immidiatelly. If I enable 'ATJUPDATEDEBUG' in plugin itself, email is also sent, so I do not think, that there is some misconfiguration, or emailing (spam) problem.
I have aprox. 10 websites with this functionality enabled, but no email received. It has various PHP versions, various MySQL versions, various hosts, various hostings. Cache time in com_installer is everywhere left to default 6 hours.
Also I noticed that language selection functionality is not functional in the plugin, but remains in its configuration.
In current version there is typo in the email text: 'nJoomla! version currently installed' - additional leading n.
Finally, I noticed that Super Administrators are checked by checking hard coded Group Id 8, which is Joomla initial Super administrators group, but could changed (it was issue on one of my sites). Would be great to have this optional, or at least documented, as it influeance the functionality a lot.
best regards
Pavel