Thanks for all the responses from PDR60 & MasterC
.I clear things out.
However,I have a question,is it correct IMAP port is 143,but not 141???
I remember IMAP port is 143...Anyway,the main thing is that you guys have clear things out.Port 25 is being blocked by ISP is reality.But I can still use my webmail because I relay all my mail to my ISP mail server.So,I can send and receive mail via webmail but not MUA.Because it is being blocked by my ISP.Is it correct?PDR60 & MasterC
Thanks for all you guys every efforts to help me.