Topic: Sender address rejected: not owned by user

[bladedavid]

Hi,

I have problem with sending email out from LAN. All messages is return back with this:

Hi. This is the qmail-send program at example.cz.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<abc@gmail.com>:
127.0.0.1 does not like recipient.
Remote host said: 553 5.7.1 <david@example.cz>: Sender address rejected: not owned by user all@exemple.cz Giving up on 127.0.0.1.

Can you help me, pls?

Thx

David

[bladedavid]

Im using SMTP server of my ISP.

[Jáder]

So I think your ISP requires authentication and your SME server is not configurated to authenticate. Please verify.