Send and receive e-mails on the administration panel and optionally receive SMS messages when new messages or comments arrive.
By default users with edit_posts capability (authors), but this can be changed with a setting.
Users with manage_options capability (administrators).
Because this is a requirement of the Zend Framework.
To receive SMS notifications from 9am to 5pm on working days you could use the following schedule:
Probably that your hosting provider has blocked POP3, IMAP and/or SMTP. Try switching from IMAP to POP3 and/or from SMTP to PHP mail and/or from SSL/TLS to unencrypted. Use the port test function to get an idea which ports are open or closed. This function does not always work correct.
See previous question. Maybe the maximum PHP execution time is exceeded. You could use for example the WP System Health plugin to check this limit.
Because e-mail messages for which SMS notifications are sent are considered as read.
The comment notification feature is known to be incompatible with the IntenseDebate Comments plugin.
You can use the forum.