NAT

[Ray Grasso]

I have a Win2K setup as a router. The clients my LAN are
unable to send email through using Outlook.
The error I receive is: 551 Command RCPT User not local
and relaying not permitted from you

Is there a setting on the NAT that I missed, or will I
need to forward ports through the router.

 

[Herb Martin]

I have a Win2K setup as a router. The clients my LAN are

unable to send email through using Outlook.
The error I receive is: 551 Command RCPT User not local
and relaying not permitted from you

Is there a setting on the NAT that I missed, or will I
need to forward ports through the router.

Nothing (directly) to do with the NAT.

This is an email server/IP address issue.

The clients are using the NAT's public (external) interface
address(es) to talk to the email server.

The email server is trying to defeat spam relaying, so only
accepts email from "internal users outbound" or from "external
users to users with accounts inbound".

It uses the networks to figure this out.

Either:
Reconfigure the email server to include the NAT
(won't be possible if it's not your email server or
in some dynamic addressing cases.)
Authenticate with the email server -- not all of them
support this, or have it enabled if they do
Use another email server to send -- perhaps one on
the NAT (it's more complicated than I am implying
perhaps)

 

[Herb Martin]

I have a Win2K setup as a router. The clients my LAN are
unable to send email through using Outlook.
The error I receive is: 551 Command RCPT User not local
and relaying not permitted from you

That's an SMTP error ( probably )
RCPT is an SMTP command and 551 is an SMTP error code.
Relaying is an SMTP concept that is typcially disabled and therefore
"not permitted."