我正在 [www.universitytutor.com](http://www.universitytutor.com) 上运行应用，让人们可以找到导师。 大多数导师都是大学生。

I'm running an app at [www.universitytutor.com](http://www.universitytutor.com) which lets people find tutors. Most of the tutors are college students.

我们会在有人联系导师后2周发出一封跟进电子邮件，询问它是怎么回事，目前有70％的人说导师从未回复他们的询问！

We send out a follow up email 2 weeks after someone contacts a tutor to ask how it went and currently 70% of them say the tutor never responded to their inquiry!

所以我试图找出如何改善电子邮件给我们导师的可传递性。 我们在ubuntu上运行postfix。 以下是我检查过的所有内容：

So I'm trying to figure out how we can improve the deliverability of emails to our tutors. We're running postfix on ubuntu. Here is all the stuff I've checked:

* 服务器IP(67.207.137.223)不在任何黑名单

上* 正确配置RDNS并解析为FQDN

* 我们有SPF记录

* 在外发电子邮件中使用DKIM签名

* The server IP (67.207.137.223) is not on any blacklists

* RDNS is configured correctly and resolves to a FQDN

* we have SPF records in place

* using DKIM signatures on outgoing emails

音量仍然很低(每天可能有500条消息)。 并且其中大多数是独特的，其中一个人通过特定查询联系另一个人，因此它不是大量邮件。 我已经检查了通过网站的消息(用于辅导工作)并且它们是合法的，保证了对教师的响应和可能的工作。 如果他们真的收到了电子邮件，我就看不出他们为什么不回应的原因。

The volume is still pretty low (maybe 500 messages per day). And most of them are unique where one person contacted another with a specific inquiry, so it's not bulk mail. I've spot checked the messages going through the site (for tutoring jobs) and they are legitimate, warranting a response and a possible job for the tutor. I can't see any reason why they wouldn't respond if they had actually gotten the email.

所有导师在创建帐户时都必须点击电子邮件中的确认链接，因此我知道他们至少收到了一封来自我们的电子邮件。 当有人报告他们没有回应时，我们也会自动删除导师档案。 因此，我不认为这是随着时间的推移而形成的情况，大多数导师已经毕业并且现在已经离开了。 70％太高了，不能仅仅通过它来解释。

All the tutors had to click a confirmation link in an email when they created their account so I KNOW they got at least one email from us. We also automatically take down tutor profiles when someone reports they didn't respond. So I don't think it's a situation that built up over time where most of the tutors have graduated and are now gone. 70% is too high to be explained just by that.

我想知道它是否可能是大学电子邮件服务器的特别之处？ 大多数导师都是大学生，并且有.edu电子邮件地址。 对于.edu邮件服务器的可传递性，这里有什么特别值得担心的吗？

I've wondered if it could be something special with university email servers? Most of the tutors are college students and have .edu email addresses. Is there anything special to worry about here in terms of deliverability to .edu mail servers?

或者我错过了我的邮件服务器配置，导致这些邮件在垃圾邮件过滤器中丢失了？

Or am I missing something else with my mail server configuration that is causing these messages to get lost in spam filters?

如果我能提供其他可能有用的信息，请告诉我。

Let me know if there is any other info I can provide which might be helpful.

P.S。 当从站点向他自己发送测试消息时，他们总是通过(Gmail在SPF和DKIM的标题中显示"通过")。 我已经用Gmail和Yahoo对它进行了测试，但两者都有效，但显然我无法在他们的.edu邮件服务器上获得一个帐户，看看它是否在那里工作。

P.S. When sending test messages to myself from the site they always come through (Gmail shows a 'pass' in the headers for both SPF and DKIM). I've tested it with Gmail and Yahoo which both work but obviously I can't get an account on their .edu mail servers to see if it works there.