I had the same problem last week, the problem was because blackberry antispam and problem solve after disable sender check.
thank's to Jake Vikers gave me this link :

http://wiki.qmailtoaster.com/index.php/FAQs#I_keep_getting_.225.1.0_-_Unknown_address_error_571-.27sorry.2C_sender_address_has_invalid_format_.28.235.7.1_-_chkuser.29.27.22_errors.2C_especially_from_people_with_Blackberry_devices._What_can_I_do.3F

----- Original Message ----- From: "Guillermo Villasana" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, September 20, 2007 5:58 AM
Subject: Re: [qmailtoaster] Error:address has invalid format why?


Yup, I was replying about it... thanks about it.

Helmut Fritz wrote:
Yup :) - see the e-mail I just sent with a wiki link...
-----Original Message-----
From: Guillermo Villasana [mailto:[EMAIL PROTECTED] Sent: Wednesday, September 19, 2007 3:52 PM
To: [email protected]
Subject: Re: [qmailtoaster] Error:address has invalid format why?

here are the headers from a rejected email thanks to everyone:

Mensaje enviado desde mi BlackBerry  de Nextel -----Original
Message-----From: [EMAIL PROTECTED] Date: 19 Sep 2007 21:57:10
To:srs0=1sove/[EMAIL PROTECTED]
ect:
failure delivery Message from  yahoo.com.Unable to deliver message to the
following address(es). <[EMAIL PROTECTED]>:Connected to
200.57.38.85 but
sender was rejected.Remote host said: 571 sorry, sender address has invalid
format (#5.7.1 - chkuser) --- Original message follows. Return-Path:
<srs0=1sove/[EMAIL PROTECTED]>X-Yah
oo-Fo
rwarded: from [EMAIL PROTECTED] to
[EMAIL PROTECTED]: [216.9.248.52]Authentication-Results: mta101.mail.re3.yahoo.com from=[protected].com.mx; [protected]keys=neutral
(no
sig)Received: from 216.9.248.52  (EHLO smtp05.bis.na.blackberry.com)
(216.9.248.52)  by mta101.mail.re3.yahoo.com with SMTP; Wed, 19 Sep 2007
14:57:08 -0700Received: from bda001.bis.na.blackberry.com
(bda186.bisx.prod.on.blackberry [172.20.228.86])    by
srs.bis.na.blackberry.com (8.13.7 TEAMON/8.13.7) with ESMTP id
l8JLv6Oh012114;    Wed, 19 Sep 2007 21:57:06 GMTReceived: from
bda186-cell02.bisx.prod.on.blackberry (localhost.local[protected]
[127.0.0.1])
by bda001.bis.na.blackberry.com (8.13.4 TEAMON/8.13.4) with ESMTP id
l8JLv1iM002617;    Wed, 19 Sep 2007 21:57:01 GMTX-rim-org-msg-ref-id:
897904691Message-ID:
<[EMAIL PROTECTED]
xe009.bisx.prod.on.blackberry>Reply-To: [EMAIL PROTECTED]:
NormalSensitivity: NormalImportance: NormalTo:
"=?Windows-1252?B?R3VpbGxlcm1vIEzzcGV6IEdhbHbhbg==?="
<[EMAIL PROTECTED]>,  [EMAIL PROTECTED]: "R G Carrillo"
<[EMAIL PROTECTED]>Subject: RV: Delivery Status Notification
(Failure)From: [EMAIL PROTECTED]: Wed, 19 Sep 2007 21:56:58
+0000Content-Type: multipart/mixed;
boundary="part28372-boundary-1409875734-1550336819"MIME-Version: 1.0
--part28372-boundary-1409875734-1550336819Content-Type: text/plain Mensaje enviado desde mi BlackBerry de Nextel -----Original Message-----From: "Mail Delivery System" <[EMAIL PROTECTED]> Date: 19 Sep
2007 21:32:07
To:SRS0=1sOVe/[EMAIL PROTECTED]
ect:
Delivery Status Notification (Failure)  The following message to
<[EMAIL PROTECTED]> was undeliverable.The reason for the
problem:5.1.0
- Unknown address error 571-'sorry, sender address has invalid format
(#5.7.1 - hkuser)' --part28372-boundary-1409875734-1550336819content-type:
message/delivery-status Final-Recipient:
rfc822;[EMAIL PROTECTED]: failedStatus: 5.0.0 (permanent
failure)Remote-MTA: dns; [200.57.38.85]Diagnostic-Code: smtp; 5.1.0 -
Unknown address error 571-'sorry, sender address has invalid format (#5.7.1
- chkuser)' (delivery attempts: 0)Reporting-MTA: dns;
smtp05.bis.na.blackberry.com
--part28372-boundary-1409875734-1550336819content-type: message/rfc822
Received: from unknown (HELO srs.bis.na.blackberry.com) ([172.20.206.29]) by smtp05.bis.na.blackberry.com with ESMTP; 19 Sep 2007 21:32:06 +0000Received:
from bda001.bis.na.blackberry.com (bda186.bisx.prod.on.blackberry
[172.20.228.86])by srs.bis.na.blackberry.com (8.13.7 TEAMON/8.13.7) with
ESMTP id l8JLW5a7014032;Wed, 19 Sep 2007 21:32:05 GMTReceived: from
bda186-cell02.bisx.prod.on.blackberry (localhost.local[protected]
[127.0.0.1])by bda001.bis.na.blackberry.com (8.13.4 TEAMON/8.13.4) with
ESMTP id l8JLW5M3014283;Wed, 19 Sep 2007 21:32:05 GMTMessage-ID:
<[EMAIL PROTECTED]
e009.bisx.prod.on.blackberry>Reply-To: [EMAIL PROTECTED]:
Sensitivity: NormalImportance: NormalTo: "Eduardo Valencia"
<[EMAIL PROTECTED]>Cc: "R G Carrillo"
<[EMAIL PROTECTED]>,"Raschid Mohamed" <[EMAIL PROTECTED]>,"Scott
Gooding" <[EMAIL PROTECTED]>Subject: RV: Estados Financieros Agosto
2007From: [EMAIL PROTECTED]: Wed, 19 Sep 2007 21:32:16
+0000Content-Type: multipart/mixed;
boundary="part28373-boundary-1409875734-1550336819"MIME-Version: 1.0
--part28373-boundary-1409875734-1550336819
--part28373-boundary-1409875734-1550336819--
--part28372-boundary-1409875734-1550336819--




Guillermo Villasana wrote:

Hello, some of my users are getting this type of message, what can be causing it?

.Remote host said: 571 sorry, sender address has invalid format (#5.7.1 - chkuser)

Thanks

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