Re: [courier-users] AUTH_REQUIRED blocks inbound mail

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Daniele Piaggesi wrote:
> I have to configure a smtp with authentication on ldap. Then I
> configured /etc/courier/esmtpd in this way:
>
> AUTH_REQUIRED="1"
> ESMTPAUTH="LOGIN"
>
> When I send a mail from my domain to other email-address with this smtp
> server (i tried with my thunderbird client) all's well: auth works fine.
> But if I send a mail with other smtp server to an address of my domain I
> have this error in /var/log/maillog
>
> Jul 20 18:22:45 xxxxx courieresmtpd:
> error,relay=::ffff:xx.xx.xx.xx,msg="535 Authentication required.",cmd: DATA
>
> and I don't know why.
>
> If I set AUTH_REQUIRED="0" in /etc/courier/esmtpd all works fine.

If you specify "Authentication Required", then no one can send mail to
your server unless they first authenticate. That's what you are seeing.
Courier rejects any mail unless the other side first authenticates.

You normally don't want this and so you should set AUTH_REQUIRED="0".
Then courier will accept mail for users at your domain, which is
probably what you want.

By default, courier is very secure. It won't accept mail for unknown
users, and it won't allow you to relay through it unless you
authenticate first. You don't have to do anything if you just want to
allow your users to relay mail if they authenticate first. Courier does
that by default.

If you are trying to do something else, then tell us what you want to
accomplish and someone can probably tell you how to do it (assuming it's
possible).

HTH

Jeff Jansen
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