The GWIA uses sending and receiving threads to process incoming and outgoing messages. The more threads you make available, the more messages the GWIA can process concurrently. However, threads place a demand on the server’s resources. Too many threads can monopolize memory and CPU utilization.
Ensure that you balance your processing speed requirements with the other applications running on the same server as the GWIA.
For information about adjusting the SMTP sending and receiving threads, see Section 30.1, Configuring Basic SMTP/MIME Settings.