There was an enhancement completed under NETWORKNET-34270 which was to enable BeginListMessages to use a MailQuery parameter. It appears as though this was done for IMAP and not POP3.
Is it planned to enhance the POP3 BeginListMessages to also include a MailQuery parameter?
At present, there is no such method available to use the MailQuery parameter with BeginListMessages of Pop3Client. An enhancement ticket with id: NETWORKNET-34303 has been logged for consideration by development team for such implementation. We’ll update you here via this thread once there is any information or a fix version available in this regard.