避免合法邮件的垃圾邮件过滤器
重复如何您确保以编程方式发送的电子邮件不会自动标记为垃圾邮件吗？
最初，我计划从我的网站以 html 形式发送电子邮件（即内容类型：text/html；），但我只是想到今天的事情，以纯文本形式发送电子邮件不是更好吗，即内容类型：text/plain;，这样我的邮件最终进入垃圾邮件/垃圾文件夹的机会就会减少，我想这必须作为 gmail、yahoo 和 hotmail 等流行网络邮件服务上的垃圾邮件过滤器使用的规则之一，您有何看法？
Duplicate of How do you make sure email you send programmatically is not automatically marked as spam?
Initially I planned to send emails from my website as html (i.e. content-type: text/html;) but I just thought about something today, won't it better to send emails as plain text, i.e. content-type: text/plain;, so that the chances of my mail messages ending up in the spam/junk folder become less, I was thinking that this must be one the rules used by spam filters on popular webmail services like gmail, yahoo and hotmail, what do you think?
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根据我的经验，大多数反垃圾邮件系统对 HTML 的 Hamminess 的评分略低于纯文本，但还有更重要的事情需要考虑，这些因素会影响送达率：
In my experience, most anti-spam systems will score HTML's Hamminess slightly below plaintext, but there are much more important things to consider that affect deliverability:
我认为为了安全起见，除了 Tim Howland 建议的之外，您始终可以先发送一封纯文本电子邮件欢迎此人，并要求将您的域名放入他们的电子邮件安全文件中。 我发现大公司经常发生这种情况； 我收到一封纯文本电子邮件，内容为“欢迎，请确保[电子邮件受保护]在您的安全电子邮件文件中。”
我不能说您的纯文本电子邮件一开始就不会被视为垃圾邮件，但至少这是确保您的 HTML 电子邮件顺利通过的简单第一步。
I think to be safe, other than what Tim Howland recommended, you could always first send a plain text email welcoming the person and asking to put your domain in their email safe file. I see this happen a lot with big companies; I get a plain text email saying "Welcome, make sure [email protected] is in your safe-email file."
I can't say that your plain text email wouldn't be considered spam in the first place, but at least this is an easy first step to ensure your HTML emails get through.