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headers contain domain info after changing myorigin and mydomain

headers contain domain info after changing myorigin and mydomain

headers contain domain info after changing myorigin and mydomain

(OP)
My organization uses internal.com as our internal domain name. So the Postfix relay server is serverX.internal.com. I need my mail to go out as having come from the example.com domain, e.g. serverX.example.com.

In my config file I have defined "myorigin = $mydomain" and then "mydomain = serverX.example.com".

Yet, message headers are showing on the next smtp server as:

Received: from serverX.internal.com (serverX.internal.com [#.#.#.#]) by serverY.example.com (serverY.example.com) with SMTP id E2.A9.14253.7F16DBF5; Tue, 24 Nov 2020 14:41:43 -0500 (EST)

The problem is that the mail is being labeled as SPAM because internal.com has been registered by someone else and it is on some SPAM blacklists.

How can I make sure that my mail headers show the message as coming from serverX.example.com rather than from serverX.internal.com?

Any help is greatly appreciated.

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