Hi folks! Probably this may be a common error, caused by a little mistake of myself during the installation process. Please let me know what's going wrong. This problem is similar as what i found on this thread: http://www.howtoforge.com/forums/showthread.php?t=125&highlight=relay When i try to send a mail via Uebimiau, inside ISPConfig, i receive this error: I verified my DNS settings on my DNS server, and everything is fine. The DNS server finds the mail server without a problem. My .zone file on the DNS server shows: I asked a friend to test if he can "see" the mail server from outside my network. After using the command Code: ping mail.valeresponde.com.br This result appears: Code: Starting against mail.valeresponde.com.br [18.104.22.168] with 32 bytes of data: Request server timeout Request server timeout Request server timeout Request server timeout Statistics of Ping to 22.214.171.124: Packets: Sent = 4, Received = 0, Lost = 4 (100% of lost) Probably something is blocking the transmission/receiving of packets from/to my network. What will i have to do? Shall i have to change settings of my DNS server? Or the problem might be the firewall? Any help it's welcome!