I'm sending emails using PHPMailer. Everything is ok but when I have GMAIL recipients my message is considered SPAM.
This is the header of the message:
Delivered-To: GMAIL RECIPIENT
Received: by 2002:a17:90a:930c:0:0:0:0 with SMTP id p12csp902239pjo;
Fri,3 May 2019 10:26:50 -0700 (PDT)
X-Google-Smtp-Source:
APXvYqzaVDtu9MY1IwDwFVItDao6xtvrlbFEFLUHKH3gBC6rLdqqQ6hkgOh42NEcioBFEtrAJuKo
X-Received: by 2002:adf:fd04:: with SMTP id e4mr8087537wrr.145.1556904410309;
Fri, 03 May 2019 10:26:50 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; t=1556904410; cv=none;
d=google.com; s=arc-20160816;
b=zIxuikro8ixhsX4eZJNRM1wqEcEvrLaLSW7h5UzLbFGCYfy4MstVjtkRXEAYH3MdMB
RRFxSLU5/4gY0qpAwNUA6g1qmCyif4JAPrsxPrFs4PYotcvkEAQcpSan5kw4NXyttM5T
SvFykeMFYhtoUksc3QAwzVIm2OK0beYvWf4vGNF7Y4HHNwzvTxzSE1pwn0xkq46VQeqa
/BX6Fbjqcxje6oG3k5ugxhpe3p3acShmI44yPrTxNla99+wyTofQjZmJyhb2Gj8sNhUO
Ef2CkMlQCFgKBsrvAk/or+L19RX+EkY122duXUhpscP+dYxbkAjfR1aJVcRMTY6OdODB
xajQ==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com
s=arc-20160816;
h=mime-version:message-id:subject:from:to:date:dkim-signature;
bh=PIhYyd0+ywcPkuj0Hoe6VNtKZaS57XHJj9uvkHRR28Q=;
b=Vb1UyR8CCpIGMcGL/dqNuJgZGEVGY5AVwcn+WmYj42pfCekCemfcUTejSH0bgoXJMQ
5YkMlSAKjTgTRPg3AYKs198bN2hIzWLS3iO6yPqeqcWvSxSexGDuXXahgOK0Ha2dvEGp
G5HIe5s+TA4vZ6a2ZXnzSFNEW8yLZQd64XOpBrssuVL9A9up8Mr/liXzEdxE4bSjvRVE
Jjlt4UWM6zMwV6jbhK2RSNqJmaYRo84PACNBf4btLrdQ8VbHUm6Y5K71eD1159JWjnwW
SixO3XoeLeTvuXdYNlBRZsa+bvLKMMvZ4OKJpaOJ3eVuzJXnE5q0D4txeIlX3QeIL3XK
ARMg==
ARC-Authentication-Results: i=1; mx.google.com;
dkim=pass header.i=@domain.it header.s=mail header.b=qscWpy85;
spf=pass (google.com: domain of services@domain.it designates IP as
permitted sender) smtp.mailfrom=services@domain.it
Return-Path: <services@domain.it>
Received: from mailout.multiwire.net (mailout.multiwire.net. [IP])
by mx.google.com with ESMTPS id v4si1624284wmj.132.2019.05.03.10.26.50
for <GMAIL RECIPIENT>
(version=TLS1_1 cipher=ECDHE-RSA-AES128-SHA bits=128/128);
Fri, 03 May 2019 10:26:50 -0700 (PDT)
Received-SPF: pass (google.com: domain of services@domain.it designates IP
as permitted sender) client-ip=IP;
Authentication-Results: mx.google.com;
dkim=pass header.i=@domain.it header.s=mail header.b=qscWpy85;
spf=pass (google.com: domain of services@domain.it designates IP as
permitted sender) smtp.mailfrom=services@domain.it
X-Spam-Status: No, hits=0.1 required=4.0 tests=AWL: 0.161, HTML_MESSAGE:
0.001, TOTAL_SCORE: 0.162,autolearn=ham
X-Spam-Level:
X-Footer: bWFpbG91dC5tdWx0aXdpcmUubmV0
Received: from mail.multiwire.net ([10.100.1.20]) (authenticated user
mail@mailout.multiwire.net) by mailout.multiwire.net with ESMTPSA (using
TLSv1.1 with cipher ECDHE-RSA-AES256-SHA (256 bits)) for GMAIL RECIPIENT;
Fri, 3 May 2019 19:31:33 +0200
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=coalvi.it; s=mail;
h=from:subject:date:message-id:to:mime-version:content-type
bh=PIhYyd0+ywcPkuj0Hoe6VNtKZaS57XHJj9uvkHRR28Q=;
b=qscWpy85HxbaA6Q6WOKlaaYwokzQW/jNn10WnXIq9kpnOAYCaUwCaCYUGjbo
/c3GLRGA07vRLGh1k
cHLKN0u7Abs0yPDnlOZZ0ApSflDudu+XVSSBFRbiB9ENbu8U+WaDQFibhhdSmmpyPnNo8Y0tfIkhtR
3KvDsSmAFtzKmWPUR0uKxbHZTnPcLrLCJErzdrJstRYLSupHyDyauHFXs2pA28W1KR2EWESMLePcBF
BptTQ7ONz5NMsxUlr1VtTKSbrwd3dYDnzXicKpR0bTCcJIKb3bzZ2wHapnuwTdGUnxuvEVVXEnNBff
z/2zNcp5O8BUOxuh7m7fKq194gn5TMg==
X-Footer: Y29hbHZpLml0
Received: from www.domain.it ([SERVER IP]) (authenticated user
services@domain.it) by mail.multiwire.net with ESMTPSA (using TLSv1.2 with
cipher ECDHE-RSA-AES256-GCM-SHA384 (256 bits)) for GMAIL RECIPIENT; Fri, 3
May 2019 19:26:48 +0200
Date: Fri, 3 May 2019 19:26:57 +0200
Return-Path: services@domain.it
To: "gmail recipient" <gmail address>
From: Services <services@domain.it>
Subject: Subject
Message-ID: <8f783abffef8e00a08ce8bb63d2cda2d@www.domain.it>
X-Priority: 3
X-Mailer: PHPMailer 5.1 (phpmailer.sourceforge.net)
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="b1_8f783abffef8e00a08ce8bb63d2cda2d"
--b1_8f783abffef8e00a08ce8bb63d2cda2d
Content-Type: text/plain; charset = "iso-8859-1"
Content-Transfer-Encoding: 8bit
TEXT
--b1_8f783abffef8e00a08ce8bb63d2cda2d
Content-Type: text/html; charset = "iso-8859-1"
Content-Transfer-Encoding: 8bit
TEXT
--b1_8f783abffef8e00a08ce8bb63d2cda2d--
I had an attachment (a .zip file) but removing it I had the same problem. I also tried removing part of the text to avoid using some wrong content. I read that some problems could be generated by links inside text but I have no links. So, I don't find why my message is classified SPAM. I made a lot of research on the Internet and found many people telling that X-Spam-Status header should be YES with a higher score than I have to consider a SPAM.
Why is my message declared as SPAM?
