我已经为此搜索了解决方案，但没有一个解决了我的问题。我也在使用谷歌应用程序。
以下是gmail上收到的邮件的副本：
Delivered-To: suporte@taskka.com.br
Received: by 10.114.37.166 with SMTP id z6csp286681ldj;
Tue, 22 Jan 2013 17:22:28 -0800 (PST)
X-Received: by 10.236.119.206 with SMTP id n54mr27422481yhh.8.1358904147674;
Tue, 22 Jan 2013 17:22:27 -0800 (PST)
Return-Path: <contato@jetcarros.com.br>
Received: from smtp-web3-ctba.kinghost.net (smtp-web3-ctba.kinghost.net. [177.12.170.3])
by mx.google.com with ESMTP id h1si4616624anp.108.2013.01.22.17.22.26;
Tue, 22 Jan 2013 17:22:27 -0800 (PST)
Received-SPF: pass (google.com: domain of contato@jetcarros.com.br designates 177.12.170.3 as permitted sender) client-ip=177.12.170.3;
Authentication-Results: mx.google.com;
spf=pass (google.com: domain of contato@jetcarros.com.br designates 177.12.170.3 as permitted sender) smtp.mail=contato@jetcarros.com.br
Received: from smtp-web-ctba.kinghost.net (smtp-web-ctba [127.0.0.1])
by smtp-web3-ctba.kinghost.net (Postfix) with ESMTP id 7C5D58F2AE
for <suporte@taskka.com.br>; Tue, 22 Jan 2013 23:22:26 -0200 (BRST)
Received: from web593.kinghost.net (unknown [10.27.86.33])
by smtp-web-ctba.kinghost.net (Postfix) with ESMTP id 7BB2BC2DFC6C
for <suporte@taskka.com.br>; Tue, 22 Jan 2013 23:22:26 -0200 (BRST)
Received: by web593.kinghost.net (Postfix, from userid 850)
id 77EA6E9B6; Tue, 22 Jan 2013 23:22:26 -0200 (BRST)
To: suporte@taskka.com.br
Subject: test mail
From: contato@jetcarros.com.br
Subject: test mail
MIME-Version: 1.0
Content-Type: text/html; charset=UTF-8
Message-Id: <20130123012226.77EA6E9B6@web593.kinghost.net>
Date: Tue, 22 Jan 2013 23:22:26 -0200 (BRST)
It's a test mail<br/>
Another line<br/>
Yet another line.
以及jetcarros.com.br上的spf：
v = spf1 ip4：177.12.170.0/24 a mx a：jetcarros.com.br include：aspmx.googlemail.com？all
在其他情况下，我发现有人说我可以通过将php邮件功能的第5个参数设置为“-f $ senderAdderess”来解决问题但是信封来自甚至没有出现在你可以在上面看到邮件。
这是我的剧本：
$email_content = implode ( "\n",array ( "It's a test mail", "Another line", "Yet another line.")
$email_headers = implode ( "\n",array ( "From: contato@jetcarros.com.br", "Subject: test mail","Return-Path: contato@jetcarros.com.br","MIME-Version: 1.0","Content-Type: text/html; charset=UTF-8" ) );
mail('suporte@taskka.com.br', 'test mail', nl2br($email_content), $email_headers, "-fcontato@jetcarros.com.br")
编辑：由于iWizardPro sugest我使用DKIM签署我的邮件，几个小时后让它正确签名我已经完成了。但我的电子邮件继续发送垃圾邮件文件夹。
欢迎任何帮助。
答案 0 :(得分：1)
我认为Gmail需要使用DKIM密钥来验证电子邮件的有效性。
当我实施网站的电子邮件系统时，我必须为Gmail添加DKIM密钥才能停止阻止我的电子邮件并将其发送到垃圾邮件。
编辑： 我相信，当您声明使用Google Apps时，此网站是相关的：http://support.google.com/a/bin/answer.py?hl=en&answer=174124
答案 1 :(得分：1)