namecrane大面积停电让我有点彷徨

朝阳群众楼主

55days ago

#11

@ElonMuskX #6 好的大佬

sv6cr

55days ago edited 55days ago

#12

自建邮局，多建几个backup mx server做冗余

见https://www.nodeseek.com/post-638640-2#17:

你需要冗余，多来几个backup mx server啊，你菜还怪自建邮局，自建邮局有什么错？

我自建的邮局就有1个backup mx server, kernel.org有2个，gmail.com最狠有4个，archlinux.org最摆烂一个都没有：

[xyz@xyzinsp ~]$ drill mx flylightning.xyz
;; ->>HEADER<<- opcode: QUERY, rcode: NOERROR, id: 31547
;; flags: qr rd ra ; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;; flylightning.xyz.	IN	MX

;; ANSWER SECTION:
flylightning.xyz.	512	IN	MX	10 mail2.flylightning.xyz.
flylightning.xyz.	512	IN	MX	0 mail.flylightning.xyz.

;; AUTHORITY SECTION:

;; ADDITIONAL SECTION:

;; Query time: 199 msec
;; SERVER: 127.0.0.53
;; WHEN: Thu Mar  5 22:11:23 2026
;; MSG SIZE  rcvd: 77
[xyz@xyzinsp ~]$ drill mx kernel.org
;; ->>HEADER<<- opcode: QUERY, rcode: NOERROR, id: 13488
;; flags: qr rd ra ; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;; kernel.org.	IN	MX

;; ANSWER SECTION:
kernel.org.	240	IN	MX	10 smtp3.kernel.org.
kernel.org.	240	IN	MX	10 smtp1.kernel.org.
kernel.org.	240	IN	MX	10 smtp2.kernel.org.

;; AUTHORITY SECTION:

;; ADDITIONAL SECTION:

;; Query time: 0 msec
;; SERVER: 127.0.0.53
;; WHEN: Thu Mar  5 22:11:27 2026
;; MSG SIZE  rcvd: 94
[xyz@xyzinsp ~]$ drill mx archlinux.org
;; ->>HEADER<<- opcode: QUERY, rcode: NOERROR, id: 21582
;; flags: qr rd ra ; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;; archlinux.org.	IN	MX

;; ANSWER SECTION:
archlinux.org.	3600	IN	MX	10 mail.archlinux.org.

;; AUTHORITY SECTION:

;; ADDITIONAL SECTION:

;; Query time: 347 msec
;; SERVER: 127.0.0.53
;; WHEN: Thu Mar  5 22:11:32 2026
;; MSG SIZE  rcvd: 52
[xyz@xyzinsp ~]$ drill mx gmail.com
;; ->>HEADER<<- opcode: QUERY, rcode: NOERROR, id: 2783
;; flags: qr rd ra ; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;; gmail.com.	IN	MX

;; ANSWER SECTION:
gmail.com.	2130	IN	MX	20 alt2.gmail-smtp-in.l.google.com.
gmail.com.	2130	IN	MX	5 gmail-smtp-in.l.google.com.
gmail.com.	2130	IN	MX	30 alt3.gmail-smtp-in.l.google.com.
gmail.com.	2130	IN	MX	10 alt1.gmail-smtp-in.l.google.com.
gmail.com.	2130	IN	MX	40 alt4.gmail-smtp-in.l.google.com.

;; AUTHORITY SECTION:

;; ADDITIONAL SECTION:

;; Query time: 197 msec
;; SERVER: 127.0.0.53
;; WHEN: Thu Mar  5 22:11:52 2026
;; MSG SIZE  rcvd: 150

而且有一点我在引用的这个帖子里没有提到，那就是电邮的网络标准（RFC?）好像规定了如果电邮服务器发一次对方没收到，过段时间服务端软件会自动再发一次，还是没收到的话他还会再发，一次比一次间隔时间长，具体会重复发几次间隔多久我不清楚，你可以搜一搜，所以其实单独一个邮局服务器走钢丝一般也没啥问题，如果单独的这个邮局服务器挂了，只要不是一连挂好几天（具体不清楚），过段时间对方电邮服务器会自动再发给你的邮局服务器你没接收到的邮件的