Could you please post part of maillog where this problem can be investigated?
Here are the logs:
mail log:
=============================================================================
Dec 28 10:02:26 HOST postfix/smtpd[9692]: connect from HSI-KBW-0xx-0xx-188-0xx.hsi2.kabel-xxxxxxxxxxxxx.de[xx.xx.188.xx]
Dec 28 10:02:26 HOST postfix/smtpd[9692]: warning: SASL authentication failure: realm changed: authentication aborted
Dec 28 10:02:26 HOST postfix/smtpd[9692]: warning: HSI-KBW-0xx-0xx-188-0xx.hsi2.kabel-xxxxxxxxxxxxx.de[xx.xx.188.xx]: SASL DIGEST-MD5 authentication failed: authentication failure
Dec 28 10:02:26 HOST postfix/smtpd[9779]: connect from HOST.de[127.0.0.1]
Dec 28 10:02:26 HOST postfix/smtpd[9692]: NOQUEUE: client=HSI-KBW-0xx-0xx-188-0xx.hsi2.kabel-xxxxxxxxxxxxx.de[xx.xx.188.xx], sasl_method=LOGIN,
[email protected]
Dec 28 10:02:26 HOST postfix/smtpd[9779]: C426C17248370: client=HSI-KBW-0xx-0xx-188-0xx.hsi2.kabel-xxxxxxxxxxxxx.de[xx.xx.188.xx]
Dec 28 10:02:26 HOST before-remote[9778]: Processing handlers...
Dec 28 10:02:26 HOST before-queue[9776]: Processing handlers...
Dec 28 10:02:26 HOST spf filter[9781]: Starting spf filter...
Dec 28 10:02:26 HOST postfix/cleanup[9780]: C426C17248370: message-id=<!&!AAAAAAAAAAAYAAAAAAAAAOX/xZOqVIdLioqvi1JXO0vCgAAAEAAAAEOoj0lGBi1FuOakDL8wZ8QBAAAAAA==@domain.com>
Dec 28 10:02:26 HOST postfix/qmgr[21809]: C426C17248370: from=<
[email protected]>, size=4486, nrcpt=1 (queue active)
Dec 28 10:02:26 HOST postfix/smtpd[9779]: disconnect from HOST.de[127.0.0.1]
Dec 28 10:02:26 HOST postfix-local[9784]: postfix-local:
[email protected],
[email protected], dirname=/var/qmail/mailnames
Dec 28 10:02:27 HOST spamd[31879]: spamd: got connection over /tmp/spamd_full.sock
Dec 28 10:02:27 HOST spamd[31879]: spamd: using default config for
[email protected]: /var/qmail/mailnames/domain.com/mailuser/.spamassassin/user_prefs
Dec 28 10:02:27 HOST spamd[31879]: spamd: processing message <!&!AAAAAAAAAAAYAAAAAAAAAOX/xZOqVIdLioqvi1JXO0vCgAAAEAAAAEOoj0lGBi1FuOakDL8wZ8QBAAAAAA==@domain.com> for
[email protected]:110
Dec 28 10:02:27 HOST spamd[31879]: spamd: clean message (0.3/5.0) for
[email protected]:110 in 0.3 seconds, 4456 bytes.
Dec 28 10:02:27 HOST spamd[31879]: spamd: result: . 0 - AWL,HTML_FONT_BIG,HTML_MESSAGE,RCVD_IN_PBL scantime=0.3,size=4456,
[email protected],uid=110,required_score=5.0,rhost=localhost,raddr=127.0.0.1,rport=/tmp/spamd_full.sock,mid=<!&!AAAAAAAAAAAYAAAAAAAAAOX/xZOqVIdLioqvi1JXO0vCgAAAEAAAAEOoj0lGBi1FuOakDL8wZ8QBAAAAAA==@domain.com>,autolearn=no
Dec 28 10:02:27 HOST spamd[31877]: prefork: child states: I
Dec 28 10:02:27 HOST postfix/pipe[9783]: C426C17248370: to=<
[email protected]>, relay=plesk_virtual, delay=0.6, delays=0.18/0.01/0/0.41, dsn=2.0.0, status=sent (delivered via plesk_virtual service)
Dec 28 10:02:27 HOST postfix/cleanup[9780]: 6048817248374: message-id=<
[email protected]>
Dec 28 10:02:27 HOST postfix/bounce[9790]: C426C17248370: sender delivery status notification: 6048817248374
Dec 28 10:02:27 HOST postfix/qmgr[21809]: C426C17248370: removed
Dec 28 10:02:27 HOST postfix/qmgr[21809]: 6048817248374: from=<>, size=3218, nrcpt=1 (queue active)
Dec 28 10:02:27 HOST postfix-local[9791]: postfix-local: from=MAILER-DAEMON,
[email protected], dirname=/var/qmail/mailnames
Dec 28 10:02:27 HOST spamd[31879]: spamd: got connection over /tmp/spamd_full.sock
Dec 28 10:02:27 HOST spamd[31879]: spamd: using default config for
[email protected]: /var/qmail/mailnames/domain.com/mailuser/.spamassassin/user_prefs
Dec 28 10:02:27 HOST spamd[31879]: spamd: processing message <
[email protected]> for
[email protected]:110
Dec 28 10:02:28 HOST spamd[31879]: spamd: clean message (0.2/5.0) for
[email protected]:110 in 1.3 seconds, 3248 bytes.
Dec 28 10:02:28 HOST spamd[31879]: spamd: result: . 0 - AWL,NO_RELAYS scantime=1.3,size=3248,
[email protected],uid=110,required_score=5.0,rhost=localhost,raddr=127.0.0.1,rport=/tmp/spamd_full.sock,mid=<
[email protected]>,autolearn=ham
Dec 28 10:02:28 HOST spamd[31877]: prefork: child states: I
Dec 28 10:02:28 HOST dk_check[9808]: DK_STAT_NOSIG: No signature available in message
Dec 28 10:02:28 HOST postfix/pipe[9783]: 6048817248374: to=<
[email protected]>, relay=plesk_virtual, delay=1.4, delays=0.02/0/0/1.4, dsn=2.0.0, status=sent (delivered via plesk_virtual service)
Dec 28 10:02:28 HOST postfix/qmgr[21809]: 6048817248374: removed
Dec 28 10:02:29 HOST postfix/smtpd[9692]: disconnect from HSI-KBW-0xx-0xx-188-0xx.hsi2.kabel-xxxxxxxxxxxxx.de[xx.xx.188.xx]
=============================================================================
Messager header:
=============================================================================
DomainKey-Status: bad
Return-Path: <
[email protected]>
X-Spam-Checker-Version: SpamAssassin 3.1.7-deb3 (2006-10-05) on HOST.de
X-Spam-Level:
X-Spam-Status: No, score=0.3 required=5.0 tests=AWL,HTML_FONT_BIG,
HTML_MESSAGE,RCVD_IN_PBL autolearn=no version=3.1.7-deb3
X-Original-To:
[email protected]
Delivered-To:
[email protected]
X-No-Auth: unauthenticated sender
Received: from HOST.de (HOST.de [127.0.0.1])
by HOST.de (Postfix) with ESMTP id C426C17248370
for <
[email protected]>; Mon, 28 Dec 2009 10:02:26 +0000 (UTC)
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws;
s=default; d=domain.com;
b=X6W8JXZtMwz5Ry8rMI1l9yKGbaqkqPDbDBQCS7zo6satKL1TT4HZVWjCi/jXbzXmkUwthPMxJits4cTUbQiV0p3jeUax5Qs3Xbu+p0qZ7scq48JIXE+cSpLAZdwUhZS7;
h=Received:Return-Receipt-To:From:To:Subject
ate:Message-ID:MIME-Version:Content-Type:X-Mailer:Thread-Index:Content-Language
isposition-Notification-To;
Received: from pc1 (HSI-KBW-0xx-0xx-188-0xx.hsi2.kabel-xxxxxxxxxxxxx.de[xx.xx.188.xx])
by HOST.de (Postfix) with ESMTP
for <
[email protected]>; Mon, 28 Dec 2009 10:02:26 +0000 (UTC)
Return-Receipt-To: "Mail User" <
[email protected]>
From: "Mail User" <
[email protected]>
To: "'Mail User'" <
[email protected]>
Subject: testmail
Date: Mon, 28 Dec 2009 11:02:27 +0100
Message-ID: <!&!AAAAAAAAAAAYAAAAAAAAAOX/xZOqVIdLioqvi1JXO0vCgAAAEAAAAEOoj0lGBi1FuOakDL8wZ8QBAAAAAA==@domain.com>
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_NextPart_000_00E2_01CA87AD.3E900BC0"
X-Mailer: Microsoft Office Outlook 12.0
Thread-Index: AcqHpNyI5Lpcwyp8SHGBxTYAX8y07A==
Content-Language: de
Disposition-Notification-To: "Mail User" <
[email protected]>
=============================================================================
Maybe the "no signature" is the problem. But how can i investigate that?
Thanks!