Berkeley CSUA MOTD:Entry 36836
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2026/05/17 [General] UID:1000 Activity:popular
5/17    

2005/3/23-24 [Computer/SW/Mail] UID:36836 Activity:moderate
3/23    I am running NAT. My smtp server (on the other side) refuses to allow
        connections from anywhere but my own domain. I am mapping my
        internal IPs to external IPs. Is there something I need to do to
        the sendmail client to prevent "550 5.7.1 Access denied"? The
        server seems to disconnect me because it sees the original
        headers. Do they need to be rewritten?
        \_ What smtp server?
           \_ Dunno. I am not the admin. I assume sendmail, but maybe not.
        \_ your question is not clear.  the smtp server is on the public
           network and you are connecting from behind nat?  if the server
           is checking tcp/ip addressing, it will see the address of
           the NAT device's WAN interface.  otherwise, it will see the
           HELO name provided by your sending agent, which perhaps also
           has to match your domain?  the internall addressing on your
           LAN should have no impact, unless you are trying to configure
           the sending agent's self-identity in a perverse way. what
           happens if you telnet to the server's smtp port?  are you
           dropped immediately or only after issuing a HELO/EHLO command?
           \_ Correct. I am not dropped immediately. I can connect and
              issue a HELO with no problems.
              \_ then what are you asking again?  can you manually
                 send a message via telnet?  can you get a trace of the
                 failing sessions?  what is different between the two?
                 I punted and use "msmtp" to deliver messages via my
                 authenticated SMTP server.
ERROR, url_link recursive (eces.Colorado.EDU/secure/mindterm2) 2026/05/17 [General] UID:1000 Activity:popular
5/17    

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