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Postfix sender sender_dependent_relayhost_maps null sender/auto reply

jp flag

I hope somebody can clarify somethings about Postfix sender dependent relayhost in postfix for me.

We are having some problems with null sender mails and auto replies not getting relayed to the correct host.

We need our postfix to handle these mails, and send them to the correct host based on the senders @domain.com so our SPF and DKIM is handled correct.

Our "sender_dependent_relay" file it like this:

@domain1.com [domain1-com.mail.protection.outlook.com]:25
@domain2.com [domain2-com.mail.protection.outlook.com]:25

Here are some of the infomation in the mail not relay as intended:

Return-Path <>
From    <[email protected]>
To  <[email protected]>

Here are some information on a mail that does relay correct:

Return-Path <[email protected]>
From    <[email protected]>
To  <[email protected]>
mangohost

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