The notification uses E-mail PHP, check with your hosting your sending limit and the amount of registered users..
Post Notification by Email is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Upload Post Notification by Email to the wp-content plugins directory.
Most email servers limit the number of recipients to 100 or less to prevent SPAM blacklisting of ISP.
If you have more than the limit of recipients, the email fails to send.
It has nothing to do with the plugin, it has to do with the email servers.
To make this plugin work for user sites, the plugin needs to have user parameter like maxrecipients=100..
It would also be idea to add user parameter like delaysend=1000 to delay sending each parsed email so the server doesn't block because of too many emails per second..
Browse the code, check out SVN repository, or subscribe to the development log by RSS... 4.1.2 23 02 2015.
Fixed Fixed the page and comments validation when save the options..
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