thanks for quick reply!
sorry for incompelete error message, here it is:
Task ‘email@example.com-Sending’ reported error (0x800CCC0F): The connection to the server was interrupted. If this problem continues, contact your server administrator or ISP.
i think my ISP is probably not blocking 25 port, because i host my domain fully on DH server, and set up my own mail service. i just created a new mail account in DH panel and everything is okay via webmail. i 'm sure i followed the steps posted on wiki…
thanks in advance for any help.