When I access Webmail, I get PHP errors such as Cannot add header information or Undefined variable: _SESSION. What is wrong?
Webmail requires a network port to operate (default: port 80). If a web server is running and already using this port, the Webmail port may need to be changed. To change the Webmail port, right-click the ISMail icon, select ‘Open’, access the ‘Webmail’ tab, enter a new value (e.g. 81), and click ‘Apply’. Then, re-start Webmail. Note that Webmail must be accessed using this port (e.g. if the port is 81, use http://127.0.0.1:81/webmail). Also, this port must not be blocked by a router or firewall software.
