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Does a proper Email ALG (i.e. Email-Proxy) alter/remove the local Email-Header information so the recipient does NOT get information about the locally used IP addresses?

Example:

Received: from mail.example.com (10.53.40.198) by
 mail.example.com (10.53.40.197) with Microsoft SMTP Server
 (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id
 15.1.2375.31; Fri, 4 Nov 2022 09:54:08 +0100

In the best case, I would want to have this information removed or replaced by the info of the ALG.

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1 Answer 1

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  • Are there email gateways which hide these internal information? - Yes.
  • Do all email gateways hide these information? - No.
  • Should the latter ones be considered a "proper Email ALG"? - There is no defined standard for the features of a "proper" Email ALG, so this depends on your specific expectation of what being "proper" means.

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