POP3-830 — A line with capability is too long
The proxy processes capabilities received from the server (in response to CAPA command) line by line. Each line is stored in a buffer. If a line is too long to fit to the buffer, this message is generated and the session is terminated. If processing long capability lines is needed, try enlarging the buffer sizes in configuration (POP3-PROXY.CLIENT-CONNECTION, POP3-PROXY.SERVER-CONNECTION).