I want to separate the outgoing and incoming mail servers.

Hello.

It runs independently a server for the web that currently has an outgoing mail server that the web uses and a general (depending on the person) total incoming mail server.I have confirmed that Postfix can do automatic transmission by web applications, but I am worried because I do not know how to receive in the same domain on another server.

Server Configuration

The two servers are physically separated.

The outgoing mail server is run by Postfix and the DNS records are as follows:

@A 163.xx.xx.xxx
@ MX10 xx.example.com
@ TXT v=spf1+ip4: 163.xx.xx.xxx-all

Measures

When 210.yy.yyy.yyyy is the IP address of the mail server I want to send and receive in general, I came up with the following method to achieve the above, but it doesn't work.

Is it impossible to take measures to prevent Postfix from being sent if MX records are changed?
I tried using Postfix transfer, but it didn't work.

Error Contents

Recipient address rejected: User unknown in local recipient table

Is this error issued by the web server (163.xx.xx.xxx) and the relay itself not working?That's right.

I would like to solve the problem without doing number 3.

Question

If editing MX records is the easiest way to solve this problem, is it possible to achieve the above in editing records?In other words, xx.example.com automatically sends mail from the Web server using Postfix, and mail to xx.example.com is received on the server 210.yy...Also enable the server at 210.yy... to send mail from xx.example.com.That's right.

Or if you want to use Postfix transfer,

relay_domains=example.com

example.com smtp: 210.yy.yy.yyyy

In addition to setting up (postmap, reloaded), how else can I achieve this?

Web Servers) xx.example.com, 163.xx.xx.xxx
210.yy.yy.yyy, yy.example.jp

I sent it again today and was able to receive it at 210.yy.yyy.yyy.
Sorry for the inconvenience.

I haven't changed the settings since yesterday, and I don't know why I can receive them. I changed it yesterday

• Postfix relay_domains and transport,
• MX record (change from MX10xx.example.com to MX10yy.example.jp)

That's it.

Postfix Log

Nov 1 12:00:13 example postfix/smtpd [9206]: NOQUUE: reject: RCPT from mail-pg0-f41.google.com [74.125.83.41]:550 5.1.1 [email protected]: Recipient address rejected: User unknown in local recipient table; [email protected] [email protected] proto=ESMTP hello=mail-pg0-f41.google.co/p>

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