To clarify the question: You mean "How do I view the mails RECEIVED by Postfix?".
Posfix delivers mails to either mbox or Maildir storage (or others; if explicitly configured to use other storage engines like a database). So Postfix is only a program to receive and store messages (for inbound mail).
So you need a program that now reads mbox or Maildir storage to present the mail in there. This is not part of Postfix. This is done by a POP3 or IMAP server which allows you to access the storage via the POP3 or IMAP protocol. The server side of the protocol is done by software like Dovecot, Cyrus, Courier or UW IMAP. The client side of the protocol is handled by Mozilla Thunderbird, Outlook, The Bat or any other mail client.
If your question was "How do I see the mails SENT by Postfix?". The answer is very easy and short: You can't. (unless you trick a lot)
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为了澄清问题：您的意思是“如何查看 Postfix 收到的邮件？”。
Posfix 将邮件传送到 mbox 或 Maildir 存储（或其他存储；如果明确配置为使用其他存储引擎，如数据库）。所以Postfix只是一个接收和存储消息的程序（对于入站邮件）。
因此，您现在需要一个可以读取 mbox 或 Maildir 存储的程序来在其中显示邮件。这不是 Postfix 的一部分。这是由 POP3 或 IMAP 服务器完成的，它允许您通过 POP3 或 IMAP 协议访问存储。协议的服务器端由 Dovecot、Cyrus、Courier 或 UW IMAP 等软件完成。该协议的客户端由 Mozilla Thunderbird、Outlook、The Bat 或任何其他邮件客户端处理。
如果您的问题是“如何查看 Postfix 发送的邮件？”。答案非常简单且简短：你不能。 （除非你骗得很多）
To clarify the question: You mean "How do I view the mails RECEIVED by Postfix?".
Posfix delivers mails to either mbox or Maildir storage (or others; if explicitly configured to use other storage engines like a database). So Postfix is only a program to receive and store messages (for inbound mail).
So you need a program that now reads mbox or Maildir storage to present the mail in there. This is not part of Postfix. This is done by a POP3 or IMAP server which allows you to access the storage via the POP3 or IMAP protocol. The server side of the protocol is done by software like Dovecot, Cyrus, Courier or UW IMAP. The client side of the protocol is handled by Mozilla Thunderbird, Outlook, The Bat or any other mail client.
If your question was "How do I see the mails SENT by Postfix?". The answer is very easy and short: You can't. (unless you trick a lot)