thanks.. if I'm understanding correctly... not sure I am because is not working...... I have a local network.... on it are a laptop... a desktop.... the PIC card I am developing code for.... and a router connected to a cable modem to the internet... the PIC card address is 192.168.0.20 ... desktop 192.168.0.2 ... laptop 192.168.0.10 ... router 192.168.0.1 ..... and the mailserver IP is 32.x.x.x .... so I ARP request and get a respone... then send SYN through TCP client..... and should get back an ACK flag.... but instead I get back RST (reset) flag.... because the mailserver is outside the 255.255.255.0 mask (ie 32.x.x.x compared to 192.x.x , the LAN router address is used ? to ARP? to send SYN to mailserver IP? ----- Original Message ----- From: "Bruce Douglas" To: Sent: Wednesday, January 21, 2004 6:32 PM Subject: Re: [PIC:] SMTP, POP3 ? > MSullivan wrote: > > Does anyone have experience with SMTP and POP3 email protocols ? > > This page has an example of the text protocol used for a pop3 transaction: > http://www.wowarea.com/english/help/poptel.htm > > This is the rfc for pop3: http://www.faqs.org/rfcs/rfc1939.html > > Here is an example of an smtp script: > http://www.aspheute.com/english/20001009.asp > > This page explains smtp in a little more detail: > http://cr.yp.to/smtp.html > > This is the smtp rfc: http://www.faqs.org/rfcs/rfc2821.html > > Authenticating smtp can be a little complicated depending on the > authentication scheme your isp uses, if you don't send mail from the > same server you dialed up to. > > Bruce Douglas > > -- > http://www.piclist.com hint: To leave the PICList > mailto:piclist-unsubscribe-request@mitvma.mit.edu > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics