You can quickly and easily enable SNMP on a Sonicwall for monitoring purposes. The instructions below are for SonicOS Enhanced, and has been tested on a NSA 2600 (although configuration should be similar on other models).
Log on to the Sonicwall through the web interface.
In the menu on the left, navigate to System → SNMP.
Check the Enable SNMP check box and click Accept.
Click the Configure button and verify/change the Get Community Name. By default, it is set to public. If you made changes, click OK.
By default, SNMP does not listen on any interface, so what's left is to enable it on one or more interfaces, depending on which interfaces, SNMP is required. Navigate to Network &r ...
To change the e-mail (relay) server for your on-premise N-Central server, you need to log in to N-Central at the product or system level. By default, this account is the same as you use to log on to the central server setup (you connect to it on port 10000 of your N-Central server). Its username is usually email@example.com.
Once logged in, navigate to Administration > Mail Network Settings > SMTP Authentication.
Make changes on this page accordingly. If you don't use a relay server, N-Central will attempt to send e-mail using MX. Else, all e-mail will be forwarded to the relay server. You can also set up authentication if your relay server requires it.