Our regular email is serviced by Google Apps for Business (premium edition) where the addresses are
We use a Google Apps free edition domain for service accounts including the main OTRS mailbox which is
This is the primary address which OTRS uses, polling the mailbox every two minutes using the OTRS fetch mail cronjob
Google Apps allows up to 30 alias email addresses per individual. We have aliases set up that correspond to queue names, e.g.
Even though all the messages go to the same
helpdesk@ourdomain.net mailbox OTRS can see the to: field of each message and routes the messages accordingly. I should think that this same method would work for technician emails as well, even though we're not using that method. In this way each of your technicians could have a proper email box in the primary company domain for regular internal correspondence, and a helpdesk email address in the service domain to give to customers to keep those emails on the helpdesk.