使用 GMail 或其他 ISP 防止电子邮件进入垃圾邮件
我想知道使用 Google 的企业电子邮件或其他知名 ISP 是否会减少进入垃圾邮件文件夹的电子邮件数量？还有哪些其他方法可以防止从服务器发送的电子邮件被视为垃圾邮件？
我目前使用 PHP send_mail() 函数发送电子邮件。
I was wondering would using Google's business email or another well known ISP decrease the amount of emails from going to spam folder? What are other ways of prevent emails sent from a server from be considered spam?
I currently send emails using the PHP send_mail() function.
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是的，使用 Google Apps（即使是免费版本）发送电子邮件会导致很少有外发邮件被标记为垃圾邮件。
请注意我遇到的两个缺点（这些也存在于所有付费版本中）：
1）如果您无权访问服务器的 DNS 区域（共享服务器上经常出现这种情况），您将无法为您的服务器 IP 添加 SPF 记录，这会增加您的电子邮件被标记为垃圾邮件的数量。
2) 在我看来，Google Apps 处理多个域的情况相当糟糕。如果您将domainA.com作为您的主要Google Apps帐户，并将domainB.com作为附加域，那么如果您从[电子邮件受保护]，标题将显示
From:[电子邮件受保护]但返回路径：[电子邮件受保护]。在某些客户端（例如 Outlook）中，这显示为From [电子邮件受保护]< /a> 代表[电子邮件受保护]和很大一部分邮件服务器会将其标记为垃圾邮件。Yes, using Google Apps (even the free version) for email results in very few of your outgoing mails being marked as spam.
Note two downsides that I've come across (these are present in all paid editions too):
1) If you don't have access to the server's DNS zones (as is often the case on a shared server), you wont be able to add an SPF record for your server's IP, which will increase the amount of your emails being marked as spam.
2) Google Apps deals with multiple domains quite badly, in my opinion. If you have domainA.com as your main Google Apps accounts, with domainB.com as an additional domain, then if you send mail from [email protected], the headers will show
From:[email protected]butReturn-Path:[email protected]. In some clients, such as Outlook, this shows asFrom [email protected] on behalf of [email protected]and a large proportion of mail servers will mark it as spam.