通过 SendGrid 的电子邮件送达率问题
我们的网络应用程序在发送电子邮件时遇到问题。这似乎非常不规律，因为大多数时候，一旦用户创建了帐户，我们的激活率就会达到 95%，但在奇数一天（比如今天），我们的激活率只有 40%。
我们与 SendGrid 进行了交谈，他们说他们的系统正在报告已发送的电子邮件，并让用户检查垃圾邮件箱 - 但用户声称垃圾邮件箱中没有电子邮件。
有人知道会发生什么吗？这开始成为一个问题，因为我们每天都会从无法激活的用户那里收到多张支持票。
影响因素之一可能是我们的大多数用户都使用 .edu 电子邮件地址。
谢谢！
沃克
We're having problems with email delivery on our web app. It seems to be very irregular, in the sense that most of the time we have a 95% activation rate once a user has created an account - but on the odd day (like today) we have only a 40% activation rate.
We talked to SendGrid and they said their system is reporting the email sent, and to have user check the spam boxes - but the users claim their are no emails in the spam boxes.
Does anyone have any idea what might be going on? It's beginning to be a problem as we get multiple support tickets daily from users who can't activate.
One influencing factor might be that most of our users use .edu email addresses.
Thanks!
Walker
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这可能发生在接收端。
当我们遇到这个问题时（仅限确认电子邮件），我们决定添加一个取消订阅链接（即使它没有意义），我们的交付能力大幅提高。
发生这种情况是因为大多数邮件服务器都会寻找取消订阅链接，并将没有取消订阅链接的电子邮件视为即时垃圾邮件，而不让它到达用户手中。
It's probably happening on the receiving end.
When we had this problem (only with confirmation emails) we decided to add an Unsubscribe link (even though it doesn't make sense) and our delivarability went way up.
This happens because most mail servers look for an unsub link, and treat emails without one as instant spam, not letting it get to the user.
我遇到了类似的问题，我的问题最终是我有一次被退回，所以电子邮件再也没有发送到该地址。如果是退回邮件问题，您可以清除 sendgrid 帐户中的退回日志，它至少应该尝试再次发送电子邮件。
I had a similar issue and my problem ended up being that I had a bounce at one time so the email never sent to that address again. If it is a bounce issue, you can clean out the bounce log in your sendgrid account and it should at least try to send the email again.
这似乎是邮件中继服务器退回邮件，因为 sendgrid 不使用静态邮件服务器 IP。
我遇到了同样的问题，并且收到类似以下消息的退回邮件：
554 IP ip 标识为拨号。
我们不接受来自您的邮件服务器的邮件，因为该服务器使用动态 IP 号码。邮件服务器应使用静态IP。如果出现错误，请联系[电子邮件受保护]。如有疑问，请联系您的系统管理员或提供商。
This seems to be the mail relay server bouncing the mails, because sendgrid is not using static mail server IPs.
I am having the same problem and I am getting bounces with messages like the following:
554 IP ip identified as dialup.
We dont accept mails from your mailserver, because the server is using a dymamic IP number. Mailserver should use a static IP. Please contact [email protected] if this is an error. In case of doubt please contact your systemadministrator or provider.
检查您的白名单向导，了解要在 DNS 中配置的其他 SMTP 服务器...看起来这很可能是我们的问题。
Check your whitelist wizard for an additional SMTP server to configure in DNS... it looks like that may well be our issue.