Did you set the mail server details correctly?

Go to the "Preferences" link in ITA (the link in the top black bar, NOT the User preferences under Tools menu). Select Web Server tab on that page, there you could set the SMTP server etc. and even try sending a test email.

 

If you have already done that, try to check E-mail test via the Troubleshooting tool of ITA. Email connectivity test can be found under Services Tier Configuration tab in Troublehsooting window.

Assuming other features of your IT Assistant install are working ok, and you are running Win2003 server, on each managed server look in the SNMP service under the Security tab.  There is a checkbox for 'Send authentication trap.'  I think this means that every time any device on your network tries to do an SNMP request to your servers that has an incorrect community name or is not on the 'accept snmp packets from these hosts,' it will generate an authentication failure message. 

 

Since your IT Assistant is logging the errors, that probably means that IT Assistant is not the device causing the errors.  You may have a variety of devices/tools on your network that are periodically doing a 'discovery' by trying to contact every valid ip address on your network with an SNMP query.  These might include HP Openview, printer/copier management tools, etc.

 

The easy solution is to uncheck the box on all of your servers.  The hard solution would be to track down whatever devices are sending the invalid SNMP requests and fix them.