macchè
l IP del mio server non è in nessuna blacklist

questo è il log di quando invio una email a icloud

Sep 12 21:50:41 ns1 postfix/smtpd[29488]: connect from unknown[95.232.159.17]
Sep 12 21:50:42 ns1 postfix/smtpd[29488]: disconnect from unknown[95.232.159.17]
Sep 12 21:50:49 ns1 postfix/master[4170]: terminating on signal 15
Sep 12 21:50:52 ns1 postfix/master[29681]: daemon started -- version 2.9.6, configuration /etc/postfix
Sep 12 21:51:38 ns1 postfix/smtpd[29754]: warning: hostname host17-159-dynamic.232-95-r.retail.telecomitalia.it does not resolve to address 95.232.159.17: Name or service not known
Sep 12 21:51:38 ns1 postfix/smtpd[29754]: connect from unknown[95.232.159.17]
Sep 12 21:51:39 ns1 postfix/smtpd[29754]: 423AE1C6057E: client=unknown[95.232.159.17], sasl_method=PLAIN, [email protected]
Sep 12 21:51:39 ns1 postfix/cleanup[29759]: 423AE1C6057E: message-id=<[email protected]>
Sep 12 21:51:39 ns1 postfix/qmgr[29700]: 423AE1C6057E: from=<[email protected]>, size=7615, nrcpt=1 (queue active)
Sep 12 21:51:39 ns1 amavis[14366]: (14366-18) NOTICE: reconnecting in response to: err=2006, HY000, DBD::mysql::st execute failed: MySQL server has gone away at (eval 111) line 170, <GEN35> line 4894.
Sep 12 21:51:41 ns1 postfix/smtpd[29763]: connect from localhost.localdomain[127.0.0.1]
Sep 12 21:51:41 ns1 postfix/smtpd[29763]: 951E91C6057F: client=localhost.localdomain[127.0.0.1]
Sep 12 21:51:41 ns1 postfix/cleanup[29759]: 951E91C6057F: message-id=<[email protected]>
Sep 12 21:51:41 ns1 postfix/qmgr[29700]: 951E91C6057F: from=<[email protected]>, size=8095, nrcpt=1 (queue active)
Sep 12 21:51:41 ns1 postfix/smtpd[29763]: disconnect from localhost.localdomain[127.0.0.1]
Sep 12 21:51:41 ns1 amavis[14366]: (14366-18) Passed CLEAN {RelayedOpenRelay}, [95.232.159.17]:54109 [95.232.159.17] <[email protected]> -> <[email protected]>, Queue-ID: 423AE1C6057E, Message-ID: <[email protected]>, mail_id: Mn4-4qhIAAbx, Hits: -2.899, size: 7615, queued_as: 951E91C6057F, 1957 ms
Sep 12 21:51:41 ns1 postfix/smtp[29760]: 423AE1C6057E: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, delay=2.7, delays=0.64/0.06/0.01/2, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 951E91C6057F)
Sep 12 21:51:41 ns1 postfix/qmgr[29700]: 423AE1C6057E: removed
Sep 12 21:51:46 ns1 postfix/smtp[29764]: 951E91C6057F: to=<[email protected]>, relay=mx3.mail.icloud.com[17.158.8.50]:25, delay=4.8, delays=0.11/0.04/1.3/3.4, dsn=2.5.0, status=sent (250 2.5.0 Ok, envelope id [email protected])
Sep 12 21:51:46 ns1 postfix/qmgr[29700]: 951E91C6057F: removed

Da quello che si vede non c'è niente di strano. Quindi le ipotesi blacklist o filtro antispam che scatta sono le più probabili.

nessuna blacklist

Checking xxx.xxx.xxx.xxx against 87 known blacklists...
Listed 0 times with 1 timeouts

Il reverse dns è settato correttamente?

yes

ho anche aggiunto il record TXT come dicono qui
sul loro supporto

Create a TXT record containing this text: v=spf1 include:_spf.google.com ~all

Non so. Alcuni vogliono che sia presente anche un record SPF.

questo è l'originale di una mail inviata a un account google

Delivered-To: [email protected]
Received: by 10.170.151.214 with SMTP id s205csp65429ykc;
        Tue, 16 Sep 2014 00:07:59 -0700 (PDT)
X-Received: by 10.181.11.133 with SMTP id ei5mr9864285wid.9.1410851279093;
        Tue, 16 Sep 2014 00:07:59 -0700 (PDT)
Return-Path: <[email protected]>
Received: from ns1.mioserver.com ([2001:41d0:a:34d::1])
        by mx.google.com with ESMTPS id az8si951771wib.60.2014.09.16.00.07.58
        for <[email protected]>
        (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
        Tue, 16 Sep 2014 00:07:59 -0700 (PDT)
Received-SPF: softfail (google.com: domain of transitioning [email protected] does not designate 2001:41d0:a:34d::1 as permitted sender) client-ip=2001:41d0:a:34d::1;
Authentication-Results: mx.google.com;
       spf=softfail (google.com: domain of transitioning [email protected] does not designate 2001:41d0:a:34d::1 as permitted sender) [email protected]
Received: from localhost (localhost.localdomain [127.0.0.1])
	by ns1.mioserver.com (Postfix) with ESMTP id 100301C60690
	for <[email protected]>; Tue, 16 Sep 2014 09:07:58 +0200 (CEST)
X-Virus-Scanned: Debian amavisd-new at ns1.mioserver.com
Received: from ns1.mioserver.com ([127.0.0.1])
	by localhost (ns1.mioserver.com [127.0.0.1]) (amavisd-new, port 10024)
	with ESMTP id 1EftyRB0Ig1z for <[email protected]>;
	Tue, 16 Sep 2014 09:07:57 +0200 (CEST)
Received: from [192.168.1.202] (unknown [95.232.159.17])
	(Authenticated sender: [email protected])
	by ns1.mioserver.com (Postfix) with ESMTPSA id 37D401C601D6
	for <[email protected]>; Tue, 16 Sep 2014 09:07:57 +0200 (CEST)
Subject: Test1

dice softfail
ma perchè???

Il messaggio compare normalmente quando l'ip del mail server non corrisponde al dominio specificato in TXT.

Cioè il TXT corretto dovrebbe essere del tipo

TXT    miodominio.com    “v=spf1 ip4:mio.ip ~all”

Ho ovviamente supposto che [email][email protected][/email] lo abbia modificato tu per postare il log. Se invece stai proprio usando quel dominio è ovvio che non vada.

si si miodominio.com l'ho modificato per postare il log
amc il mio TXT ora è cosi : v=spf1 include:_spf.google.com ~all
ma prima avevo: v=spf1 a mx ptr ip4:mioip ~all
e andava in spam anchec on quello