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Since the client is not a mail server - it can't use port 25 therefore, the client system will auto select a port above 1024 and the mail server will communicate on ports 25, 110 and 143. Your firewall will have to allow outbound traffic from any internal port greater than 1024 to external ports 25, 110 and 143. Your firewall will also need to allow inbound traffic from external ports 25, 110 and 143 to any internal port greater than 1024. Your default server port can be changed by specifying the desired port number in the MailPort property for SMTP or POP3 and IMAP4, plus adjusting the mail server to listen on those ports (client port can't be changed). I am unable to broadcast any emails?If your PCs modem is directly connected to the Internet and you can't broadcast any emails... See: PING for Network trouble shooting or Telnet to determine if the problem is with your Internet connection. Mail Server - If you are using your own mail server program (sending mails from your PCs). See: Mail Server FAQs? IP Address Nslookup - To find out your server IP address. Use windows DOS "Command Prompt" (click Start/Programs/Accessories), when the DOS screen opens, at the prompt enter nslookup followed by the name of the domain. Example - if your domain is mailsbroadcast.com enter;
nslookup mailsbroadcast.com [hit enter
key] to display
your domain IP address. |
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Therefore, since a LAN cannot be seen from the outside (all workstation hidden from the Internet), registration of the internal IP addresses or Local IP Address (below) will not be necessary and the normal range of private addresses allocated are: 10.0.0.0 - 10.255.255.255 - 172.16.0.0 - 172.31.255.255 - 192.168.0.0 and 192.168.255.255 See Private Network NAT Therefore, any LAN workstation connected to the Internet needs an IP address, LAN router IP address, IP address name server and NAT subnet mask interface. And the LAN system must also set-up a service table of fixed IP address mappings that allows packets to originate from the outside. Local IP Address When 2 computers try to communicate, an ARP request is initiated--if the IP address is on the local network, it (the source host) checks its ARP cache to see if it has the hardware MAC address of the receiving host--if not, a broadcast is sent to all local hosts.
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