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Outlook 2010 | Windows 7

Can someone please elaborate on the difference between the content-language and accept-language email headers?

When do these get added by Outlook 2010 and where can I configured these values?

Here's an example:

From: Mike <>
To: Bob <>
Date: Tue, 9 Oct 2012 11:25:30 -0700
Subject: Test Message
Thread-Topic: Test Message
Thread-Index: Ac2mSsdlkfjsdlkfjlsdfsd4k04YqkZA==
Message-ID: <>
Accept-Language: en-US
Content-Language: en-US

I'm aware that for HTTP, Content-Language is from the server, and lets the client know what language(s) are present on the requested page. Accept-Language is from the client, and lets the server know the user's preferred language(s). Is this the same for email?

I have a use case where I'd like a downstream content-filter to key off the language header and perform an action if a certain language is present.

I'm guessing that these are set in the Outlook Options >> Language section but would like confirmation.

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closed as off-topic by masegaloeh, HBruijn, Andrew Schulman, MadHatter, Xavier Lucas Feb 17 at 15:34

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If this question can be reworded to fit the rules in the help center, please edit the question.

To the best of my knowledge, these are not properly standardized for email, and only used (or more like abused) by Microsoft. To add insult to injury, it appears that Exchange sets Accept-Language: based on the server's settings, and does not offer a per-user override. – tripleee Dec 11 '13 at 8:48