Can't obtain my mail

I am not receiving or able to send any mail. This is a message I am getting.
Also, it mentions POP3
2:49:25 PM at MailClient.Commands.Command.Process(WorkerStatus status)


POP3 is protocol for receiving emails only, is there any error about SMTP? Anyway write me what version exactly do you use and also go to Tools - Operations then click “send and receive” and tell me what is happening in first two tabs.