I'm having a similar problem.
I also have an old linksys router (BEFSR41 vers 2).
I tried installing Eudora but still get a problem. Eudora gives more details though.
From Eudora I get this message:
TCP/IP Error -3162 The server is not responding
Changing Eudora to give me a detailed log the following trace occurs when connected directly to the cable modem (send works)
Sun Nov 12 09:54:45 2006
26429440 262144:20.27.21 DNS Lookup of "shawmail.cg.shawcable.net"
26429440 262144:0.0.0 24.71.223.43 (1)
26429440 262144:0.0.0 Connecting to 24.71.223.43:110
26429440 262144:0.0.1 Connected to 24.71.223.43:110
26429440 32:0.0.34 Rcvd: “+OK Messaging Multiplexor (iPlanet Messaging Server 5.2 (built Feb 21 2002))\r\n”
26429440 32:0.0.35 Sent: “CAPA\r\n”
26429440 32:0.0.55 Rcvd: “-ERR invalid command\r\n”
26429440 32:0.0.55 Sent: “USER larry.williams\r\n”
26429440 32:0.1.14 Rcvd: “+OK password required for user larry.williams@shaw.ca\r\n”
26429440 32:0.1.15 Sent: “PASS
*****\r\n”
26429440 32:0.2.55 Rcvd: “+OK Maildrop ready\r\n”
26429440 32:0.2.56 Sent: “STAT\r\n”
26429440 32:0.3.34 Rcvd: “+OK 1 1184\r\n”
26429440 32:0.3.35 Sent: “LIST\r\n”
26429440 32:0.4.1 Rcvd: “+OK scan listing follows\r\n”
26429440 32:0.4.1 Rcvd: “1 1184\r\n”
26429440 32:0.4.1 Rcvd: “.\r\n”
26429440 32:0.4.2 Sent: “UIDL\r\n”
26429440 32:0.4.22 Rcvd: “+OK unique-id listing follows\r\n”
26429440 32:0.4.22 Rcvd: “1 3004-1108604092\r\n”
26429440 32:0.4.22 Rcvd: “.\r\n”
26429440 2:0.4.22 shawmail.cg.shawcable.net 110 (1)
26429440 32:0.4.23 Sent: “DELE 1\r\n”
26429440 32:0.4.36 Rcvd: “+OK message deleted\r\n”
26429440 32:0.4.36 Sent: “QUIT\r\n”
Sun Nov 12 09:55:49 2006
26534912 1:1.3.58 shawmail.cg.shawcable.net 25
26534912 262144:0.0.1 DNS Lookup of "shawmail.cg.shawcable.net"
26534912 262144:0.0.1 24.71.223.43 (1)
26534912 262144:0.0.1 Connecting to 24.71.223.43:25
26534912 262144:0.0.2 Connected to 24.71.223.43:25
26534912 32:0.0.10 Rcvd: “220 pn2ml10so.prod.shaw.ca -- Server ESMTP (Sun ONE Messaging Server 6.0 HotFix 1.01 (built Mar 15 2004))\r\n”
26534912 32:0.0.11 Sent: “EHLO [68.147.171.4]\r\n”
26534912 32:0.0.15 Rcvd: “250-pn2ml10so.prod.shaw.ca\r\n”
26534912 32:0.0.15 Rcvd: “250-8BITMIME\r\n”
26534912 32:0.0.15 Rcvd: “250-PIPELINING\r\n”
26534912 32:0.0.15 Rcvd: “250-DSN\r\n”
26534912 32:0.0.15 Rcvd: “250-ENHANCEDSTATUSCODES\r\n”
26534912 32:0.0.15 Rcvd: “250-EXPN\r\n”
26534912 32:0.0.15 Rcvd: “250-HELP\r\n”
26534912 32:0.0.15 Rcvd: “250-XADR\r\n”
26534912 32:0.0.15 Rcvd: “250-XSTA\r\n”
26534912 32:0.0.15 Rcvd: “250-XCIR\r\n”
26534912 32:0.0.15 Rcvd: “250-XGEN\r\n”
26534912 32:0.0.15 Rcvd: “250-XLOOP AC99CF13C172C56F938F5FBB9462118D\r\n”
26534912 32:0.0.15 Rcvd: “250-ETRN\r\n”
26534912 32:0.0.15 Rcvd: “250 SIZE 0\r\n”
26534912 262144:0.0.15 ESMTP has NFI what “pn2ml10so.prod.shaw.ca” is supposed to mean
26534912 262144:0.0.15 ESMTP mime8bit
26534912 262144:0.0.15 ESMTP pipeline
26534912 262144:0.0.15 ESMTP has NFI what “DSN” is supposed to mean
26534912 262144:0.0.15 ESMTP has NFI what “ENHANCEDSTATUSCODES” is supposed to mean
26534912 262144:0.0.15 ESMTP has NFI what “EXPN” is supposed to mean
26534912 262144:0.0.15 ESMTP has NFI what “HELP” is supposed to mean
26534912 262144:0.0.15 ESMTP has NFI what “XADR” is supposed to mean
26534912 262144:0.0.15 ESMTP has NFI what “XSTA” is supposed to mean
26534912 262144:0.0.15 ESMTP has NFI what “XCIR” is supposed to mean
26534912 262144:0.0.15 ESMTP has NFI what “XGEN” is supposed to mean
26534912 262144:0.0.15 ESMTP has NFI what “XLOOP” is supposed to mean
26534912 262144:0.0.15 ESMTP has NFI what “ETRN” is supposed to mean
26534912 262144:0.0.15 ESMTP size 13
26534912 262144:0.0.15 SMTP auth not available, disabling
26534912 1:0.0.15 Sending larry.williams@calgary.ca, 9:55 AM -0700, Out going mail test.
26534912 32:0.0.16 Sent: “RSET\r\n”
26534912 32:0.0.20 Rcvd: “250 2.5.0 Ok.\r\n”
26534912 32:0.0.20 Sent: “MAIL FROM:<larry.williams@shaw.ca> size=1024\r\n”
26534912 32:0.0.24 Rcvd: “250 2.5.0 Address and options OK.\r\n”
26534912 32:0.0.24 Sent: “RCPT TO:<larry.williams@calgary.ca>\r\n”
26534912 32:0.0.28 Rcvd: “250 2.1.5 larry.williams@calgary.ca OK.\r\n”
26534912 32:0.0.29 Sent: “DATA\r\n”
26534912 32:0.0.33 Rcvd: “354 Enter mail, end with a single ".".\r\n”
26534912 32:0.0.33 Sent: “Mime-Version: 1.0\r\n”
26534912 32:0.0.33 Sent: “Message-Id: <a06240800c17d026222a9@[68.147.171.4]>\r\n”
26534912 32:0.0.33 Sent: “Date: Sun, 12 Nov 2006 09:55:49 -0700”
26534912 32:0.0.33 Sent: “\r\n”
26534912 32:0.0.33 Sent: “To: larry.williams@calgary.ca\r\n”
26534912 32:0.0.33 Sent: “From: Larry Williams <larry.williams@shaw.ca>\r\n”
26534912 32:0.0.33 Sent: “Subject: Out going mail test\r\n”
26534912 32:0.0.33 Sent: “Content-Type: text/plain; charset="us-ascii" ; format="flowed"\r\n”
26534912 32:0.0.33 Sent: “\r\n”
26534912 32:0.0.33 Sent: “This one will work. I am attached directly to the cable modem.\r\n”
26534912 32:0.0.33 Sent: “.\r\n”
26534912 32:0.0.41 Rcvd: “250 2.5.0 Ok.\r\n”
26534912 1:0.0.41 Succeeded.
26534912 32:0.0.43 Sent: “QUIT\r\n”
26534912 32:0.0.47 Rcvd: “221 2.3.0 Bye received. Goodbye.\r\n”
When I reconnect the router I get the following log:
Sun Nov 12 10:12:33 2006
26435072 262144:1.32.5 DNS Lookup of "shawmail.cg.shawcable.net"
26435072 262144:0.0.0 24.71.223.43 (1)
26435072 262144:0.0.0 Connecting to 24.71.223.43:110
26435072 262144:0.0.0 Connected to 24.71.223.43:110
26435072 32:0.0.29 Rcvd: “+OK Messaging Multiplexor (iPlanet Messaging Server 5.2 (built Feb 21 2002))\r\n”
26435072 32:0.0.29 Sent: “CAPA\r\n”
26435072 32:0.0.45 Rcvd: “-ERR invalid command\r\n”
26435072 32:0.0.46 Sent: “USER larry.williams\r\n”
26435072 32:0.1.2 Rcvd: “+OK password required for user larry.williams@shaw.ca\r\n”
26435072 32:0.1.2 Sent: “PASS
*****\r\n”
26435072 32:0.3.39 Rcvd: “+OK Maildrop ready\r\n”
26435072 32:0.3.39 Sent: “STAT\r\n”
26435072 32:0.4.11 Rcvd: “+OK 0 0\r\n”
26435072 32:0.4.13 Sent: “QUIT\r\n”
Sun Nov 12 10:14:58 2006
25930752 1:2.24.34 shawmail.cg.shawcable.net 25
25930752 262144:0.0.2 DNS Lookup of "shawmail.cg.shawcable.net"
25930752 262144:0.0.2 24.71.223.43 (1)
25930752 262144:0.0.3 Connecting to 24.71.223.43:25
25930752 262144:0.0.4 Connected to 24.71.223.43:25
25930752 32:0.0.8 Rcvd: “Your IP is presently being blocked, Please call your ISP for assistance.\r\n”
25930752 8:0.0.8 TCP/IP Error.
25930752 8:0.0.8 -3162
25930752 8:0.0.8 The server is not responding.
25930752 8:0.0.8 {37:583}
25930752 8:0.0.8 “TCP/IP Error. -3162; ” “The server is not responding. {37:583}”
Sun Nov 12 10:15:37 2006
MAIN 8:0.39.32 You have some message(s) waiting to be sent. Do you want to send them now?
MAIN 8:0.2.1 Dismissed with 3.
Have you tried Eudora?
2x2.5G5 Mac OS X (10.4.7) 