Strange error message

Hi, from some days i receive this strange message every time that an user write through my site.

Any solution?

"This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

-fwebmaster@xxx.com

No Such User Here

------ This is a copy of the message, including all the headers. ------

Return-path: <webmaster@xxx.com>

Received: from localhost ([1.0.0.1]:42111 helo=serv01.sitehost.com)

by serv01.sitehost.com with smtp (Exim 4.69)

(envelope-from <webmaster@xxx.com>)

id 1Knz29-0004Qw-UA; Thu, 09 Oct 2008 12:10:37 -0500

X-SG-User: xxx

To: vam@xxx.com

Subject: =?UTF-8?B?UmU6hleQ==?=

Content-type: text/plain; charset=UTF-8

MIME-Version: 1.0

From: =?UTF-8?B?V2FzbG92ZS5jb20gLSBUSfdfsdfrewerr9LRU4gSEVBUlRTIA==?= <webmaster@xxx.com>

Dear Vam,

We are glad to inform you that the member

Parsit (http://www.xxx.com/Parsit) has sent you a message!

-------- Message ------------------------------------------------

XXX

---------------------------------------------------------------------

Thank you for using our services!

--

xxx.com mail delivery system!!!

Auto-generated e-mail, please, do not reply!!!

only 1 solution - you need to turn off afto activation - and set activation via e-mail addresses.

After it all your users will be use only correct e-mails

Regards

Artur A

sorry could you explain me better? i didnt understand :-)

of course I can.

open your Admin area >> Settings >> Moderation Settings

and change Automatic profile confirmation without Confirmation Email

it shouldn't be checked.

After this action  - all new members will be activated only after they will confirm that their e-mail addresses are valid.

Regards

Artur A

thanks a lot but if i made this action members are authomatically added...

if you will set in this way - all users won't be activated before they will comfirm their e-mail addresses.

Regards
Artur