smtp proxy with postfix

[B.R.]

smtp_auth set + xclient on
smtp_auth none + xclient off
?
---
*B. R.*

On Fri, Dec 18, 2015 at 8:08 PM, Cugar15 <nginx-forum at nginx.us> wrote:

> Hello,
>
>   I'd like to build a smtp Proxy with nginx (v1.8.0) and postfix (v2.9.6)
> on
> Debian7.
>
> Somehow I'm stuck with the following problem:
>
> 1) Configuration1:
>     smtp_auth         login plain cram-md5;
>     xclient               on;
>
>     ==> a) My mail client can authenticate (IP:yy.yyy.yy.yy), send email
> and
> receive email (imap) - even with tls
>                 mail.log:
>                  connect from nginx_prox.de[xx.xxx.xx.xx]
>                  client=unknown[yy.yyy.yy.yy], sasl_method=XCLIENT,
> sasl_username=my_username
>
>             b) But no emails from others are received - obviously everybody
> has to authenticate!!
>
> 2) Configuration2:
>     smtp_auth         none;
>     xclient               on;
>
>     ==> creates an open relay!
>
> In Postfix, I have set: smtpd_authorized_xclient_hosts = xx.xxx.xx.xx
>
> What I'd like to achive is the current postfix behaviour:
> 1) Receive emails from every Sender
> 2) Only authorized users can send emails from outside the Network
>
> Help is appreciated... I found bits and pieces in the Forum and other
> places
> - but nothing seems to be consistent...
>
> Thanks,
> Norbert
>
> Posted at Nginx Forum:
> https://forum.nginx.org/read.php?2,263559,263559#msg-263559
>
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