That almost sounds like the isp has a transparent proxy in the way. Do
you have multiple public IP addresses? Can you check from one of them?
If you turn on logging for the smtp rule, or traffic capture on the mail
host, what do you see? Does the same problem occur with the old software
on the new IP address?

Tim  
-----Original Message----- 
From: gvacanti at cosine dot nl 
To:  <gvacanti at cosine dot nl> 
To:  <m0n0wall at lists dot m0n0 dot ch> 
 
Sent: 22/03/2008 16:18:06 
Subject: [m0n0wall] Problem with port 25 
 
Hello, 
 
I have recently had to change my external IPs, and I have at the same 
time installed version 1.233. I experience now the following problem. 
 
I have a NAT configuration that sends port 25 on the WAN to a host on my

internal network. On the internal network I can telnet to port 25 and 
everything is fine. From the external network, this is what I get: 
 
telnet mysmtp 25 
Trying xxx.xxx.xxx.xxx... 
Connected to mysmtp. 
Escape character is '^]'. 
220 *************** 
ehlo sample.com 
250-mysmtp 
250-PIPELINING 
250-SIZE 31000000 
250-ETRN 
250-XXXXXXXA 
250-ENHANCEDSTATUSCODES 
250-8BITMIME 
250 DSN 
 
The response is somewhat garbled. Delivery of email works, but because 
the ehlo does not return STARTTLS the communication is never encrypted. 
 
What puzzles me no end, is that if I NAT another port (I have tried 2525

and 23), the response is ok 
 
telnet mysmtp 2525 
Trying xxx.xxx.xxx.xxx... 
Connected to mysmtp. 
Escape character is '^]'. 
220 mysmtp ESMTP 
ehlo sample.com 
250-mysmtp 
250-PIPELINING 
250-SIZE 31000000 
250-ETRN 
250-STARTTLS 
250-ENHANCEDSTATUSCODES 
250-8BITMIME 
250 DSN 
 
Does this ring a bell with anybody? 
 
Thanks, Giuseppe 
 
 
 
 
 
 
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