Customer context: The customer wants to know how to change default reply from address for outgoing emails sent from his LiveAgent account.
Customer: How can I change the default reply email address in LiveAgent?
Answer: In LiveAgent, administrators have the option to allow chosen outgoing email accounts for each department separately, allowing agents to reply to tickets using only selected email addresses, or force replying to tickets in a specific department only from one particular outgoing email account. This ability to set up multiple outgoing email accounts can be accessed in Configuration > Departments, followed by clicking on the department name. For more information, see this KB article: https://support.liveagent.com/381336-Configuring-Department-Specific-Outgoing-Email-Accounts.