Domains, post offices, and mailboxes are supported by four GroupWise agents:
POA: The Post Office Agent (POA) responds to GroupWise client requests for mailbox data and delivers messages between users’ mailboxes in a post office. The POA also communicates with the MTA to route messages to and from the post office. In addition, the POA performs a variety of maintenance tasks in the post office.
MTA: The Message Transfer Agent (MTA) transfers messages between post offices and domains, and performs a variety of other functions in the domain.
GWIA: The Internet Agent (GWIA) converts GroupWise messages into SMTP format and transfers them to the Internet SMTP hosts where recipients are located. In reverse, it receives SMTP messages from Internet SMTP hosts and converts them into GroupWise format. The GWIA can also provide access for POP3 and IMAP4 clients to access GroupWise mailboxes.
DVA: The Document Viewer Agent (DVA) converts attached document files from a wide variety of formats into HTML format for indexing by the POA and for viewing in GroupWise WebAccess. You can run up to three DVAs to service conversion requests for a single instance of the POA. Each DVA must be installed on a different server.