TxHelpdesk allows you to add certain e-mail addresses to be ignored by the system while reading e-mails. Please follow the steps below to add ignored email address.
Go to Admin => Ignored email address
Click on Add 
Add Ignored email address form will be displayed. Enter all the fields and click on Save
Details about the fields 
Queues:  Select the required queues.  Leave blank for this e-mail to be ignored on all queues, or select those queues you wish to ignore this e-mail for. Hold down "Control", or "Command" on a Mac, to select more than one.

Name: Name
E-Mail Address: Enter a full e-mail address, or portions with wildcards, eg *@domain.com or postmaster@*.
Save Emails in Mailbox? Do you want to save emails from this address in the mailbox? If this is unticked, emails from this address will be deleted.