On Sat, 28 Mar 2009, Robinson, Eric wrote:

> On my postfix server, when I send to outside users using the 'mail'
> command, the remote mail server rejects the messages with an 'unknown
> domain' error because they are coming from [email protected].

Is host.domain.com the FQDN of your Postfix server?  Why is it an invalid
internet address?

> However, if I telnet to postfix locally and submit the message using
> 'mail from:root' (no domain specified) then the messages go through fine
> and on the remote mailserver they appear to come from '[email protected]'.

Odd that host.domain.com is invalid while domain.com is OK.  Please provide
more information like the output of 'postconf -n'  (see DEBUG_README), 
and in the meantime read: 
http://www.postfix.org/postconf.5.html#masquerade_domains

-- 
Sahil Tandon <[email protected]>

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