Need email server aid

[Alvin Thompson]

On 04/21/2010 12:41 PM, Chuck Kuecker wrote:
> The Ubuntu machine relays emails from my Windows machine just fine, but
> when I try to relay an email from an embedded system I am working with,
> that resides on my local network, I get error messages in mail.log -
> 'relay access denied'. Sending email from the embedded system to my
> local email account works fine.
...
> I've enabled the entire local network here in /etc/postfix/main.cf -
> mynetworks = 127.0.0.0/8, 192.168.0.0/16. My Windows machine SMTP is set
> to use TLS, if available, and my user name. I'm thinking that I need to
> send my user name and password somehow, in order to get relaying to
> work. I don't see any SMTP commands that would do this.

You should not have to use a name and password if the computer is on a 
trusted network.  You've already done the first part (adding your 
network to 'mynetworks').  You also need to tell postfix to allow 
relaying from those networks.  Under 'smtpd_recipient_restrictions', 
make sure 'permit_mynetworks' is listed.  It probably has to be in a 
specific order to work properly.  Here's what mine looks like:

smtpd_recipient_restrictions =
         reject_unknown_sender_domain,
         reject_unknown_recipient_domain,
         reject_unauth_pipelining,
         permit_mynetworks,
         permit_sasl_authenticated,
         reject_unauth_destination

Hope that helps,
Alvin


p.s. - if that doesn't work, you will have to post the results of 
'postconf -n' as Markus suggested.