Question

我想在我的网站上注册时创建一个SMTP验证，但我在GMail SMTP服务器上遇到了一个奇怪的行为。验证看起来像发送电子邮件：在与SMTP服务器建立连接后，我发送命令 EHLO ， HELO ， MAIL FROM ， RCPT TO < / strong>和退出。 HELO 和 MAIL FROM 等命令不会花费很多时间，但命令 RCPT TO 在GMail上大约需要3秒钟。例如，在其他几台服务器上，此命令只需200-300毫秒。

此外，如果我检查现有的电子邮件地址， RCTP 命令只需要600-900毫秒，但对于未显示的地址，此延迟总是需要3秒以上。

我认为，这种延迟是反垃圾邮件行为，但我如何绕过它？我的域名已经有正确的 TXT-SPF 和 SPF 记录。我的服务器未列在任何垃圾邮件列表中。

Answer 1

我没有看到您在RCPT TO之后报告的延迟。我运行一个邮件服务器，使用远程MTA记录每个传送的记录。看看最近几次发送到gmail地址，我看到gmail的服务器几乎在RCPT TO之后立即响应了250 OK。见下文。（电子邮件地址和IP匿名保护无辜！）。

Tue Jul 23 16:01:52 2013 GMT DNS MX record lookup for gmail.com:
Tue Jul 23 16:01:52 2013 GMT MX1=gmail-smtp-in.l.google.com, MX2=alt1.gmail-smtp-in.l.google.com, MX3=alt2.gmail-smtp-in.l.google.com
Tue Jul 23 16:01:52 2013 GMT Attempting SMTP connection from smtp.myserver.com [x.x.x.x] to gmail-smtp-in.l.google.com [173.194.64.27] on port 25
Tue Jul 23 16:01:52 2013 GMT Delivery id 813435, process id 21352
Tue Jul 23 16:01:52 2013 GMT received from remotehost: 220 mx.google.com ESMTP b5si18818338obh.145 - gsmtp
Tue Jul 23 16:01:52 2013 GMT smtp.myserver.com sent: EHLO smtp.myserver.com
Tue Jul 23 16:01:52 2013 GMT received from remotehost: 250-mx.google.com at your service, [x.x.x.x]
250-SIZE 35882577
250-8BITMIME
250-STARTTLS
250-ENHANCEDSTATUSCODES
250 PIPELINING
Tue Jul 23 16:01:52 2013 GMT smtp.myserver.com sent: STARTTLS
Tue Jul 23 16:01:52 2013 GMT received from remotehost: 220 2.0.0 Ready to start TLS
Tue Jul 23 16:01:52 2013 GMT starting TLS...
Tue Jul 23 16:01:52 2013 GMT TLS Enabled.
Tue Jul 23 16:01:52 2013 GMT smtp.myserver.com sent: EHLO smtp.myserver.com
Tue Jul 23 16:01:52 2013 GMT received from remotehost: 250-mx.google.com at your service, [x.x.x.x]
250-SIZE 35882577
250-8BITMIME
250-ENHANCEDSTATUSCODES
250 PIPELINING
Tue Jul 23 16:01:52 2013 GMT smtp.myserver.com sent: MAIL FROM: <sender@sender.com>
Tue Jul 23 16:01:52 2013 GMT received from remotehost: 250 2.1.0 OK b5si18818338obh.145 - gsmtp
Tue Jul 23 16:01:52 2013 GMT smtp.myserver.com sent: RCPT TO: <recipient@gmail.com>
Tue Jul 23 16:01:52 2013 GMT received from remotehost: 250 2.1.5 OK b5si18818338obh.145 - gsmtp
Tue Jul 23 16:01:52 2013 GMT smtp.myserver.com sent: DATA
Tue Jul 23 16:01:52 2013 GMT received from remotehost: 354  Go ahead b5si18818338obh.145 - gsmtp
Tue Jul 23 16:01:52 2013 GMT [sending message...] (14871 bytes)
Tue Jul 23 16:01:52 2013 GMT [message sent]
Tue Jul 23 16:01:53 2013 GMT received from remotehost: 250 2.0.0 OK 1374595312 b5si18818338obh.145 - gsmtp

在GMail上执行RCTP命令后延迟

1 个答案: