From Dazler Software:
Agent by Forte is a Usenet and e-mail reader. It features kill and watch filters, sorting, support for MIME/Base 64 encoded attachments, and more. It has multiple inbound (POP) email accounts and multiple outbound (SMTP) servers.
What's new in this version:
Version 7.0 build 1200 has re-engineered for high capacity USENET servers.