Using Triggers, you can customize the auto-responses different Users receive when submitting new tickets depending on which of your incoming email addresses it was sent to.
For example, if your default auto-response message is something along the lines of:
Thanks for getting in touch; one of our support agents will get in touch soon.
Then, you may want to create a different auto-response for your Sales email (firstname.lastname@example.org), that offers Users a free trial.
You need to create a new email template for the custom response. You can do this in Admin > Channels > Email > Templates. For more information about creating Email Templates, see the Admin Guide: Creating New Email Templates.
Turn off the default auto-response
Firstly, you don't want users to get the default auto-response, in addition to your custom response, so go to Admin > Business Rules > Triggers.
Under the tab, New Ticket Triggers open the Trigger in Apply: Global called ‘Send auto-reply confirmation to user’.
In the menu that opens, update the Criteria to Email Account | is not | email@example.com and save the changes.
Now, any tickets that are submitted to the Sales email will no longer receive the default auto-response.
Create a new Auto-Response Trigger
Next, you need to create the Auto-Response Trigger for your Sales email. In the same Ticket Triggers menu (Admin > Business Rules > Triggers), click Add New Trigger.
Under Criteria, select Email Account | is | firstname.lastname@example.org
In Actions, add Send email to User and select the Email Template you created. If you haven't created one yet, you can create one in Admin > Channels > Emails > Templates.