Question

客户端正在尝试发送一个相当大的电子邮件，但它会被以下消息退回：

Hi. This is the qmail-send program at server2.hysir.net.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<maria@laeknastodin.is>:
157.157.98.19 failed after I sent the message.
Remote host said: 552 5.3.4 Error: message file too big

我已经检查过，我们的终端上的邮件大小没有限制，这个IP地址即157.157.98.19是接收邮件服务器的IP，我是否正确认为laeknastodin.is的邮件服务器正在否认邮件由于其大小而不是我们的smtp拒绝发送？

Answer 1

Remote host said: 552 5.3.4 Error: message file too big

错误消息明确指出接收主机正在限制邮件大小。如果使用telnet进行检查，可以看到目标主机上配置的限制为20 MB（20480000字节）

telnet 157.157.98.19 25
Trying 157.157.98.19...
Connected to 157.157.98.19.
Escape character is '^]'.
220 mail.laeknastodin.is ESMTP Postfix
EHLO example.com
250-mail.laeknastodin.is
250-PIPELINING
250-SIZE 20480000     <----------- 20 MB limit
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN

“错误：消息文件太大”是传出端还是接收端的限制？

1 个答案: