![]() X-Google-Smtp-Source: Shows the email transferring using a Gmail SMTP server.X-Received: Differs from "Received" in that it is considered non-standard that is to say, it might not be a permanent address, such as a mail transfer agent or Gmail SMTP server.ARC-Seal: "Seals" the ARC authentication results and the message signature, verifying their contents similar to DKIM.ARC-Message-Signature: The signature takes a snapshot of the message header information for validation, similar to DKIM.ARC-Authentication-Results: The Authenticated Receive Chain is another authentication standard ARC verifies the identities of the email intermediaries and servers that forward your message to its final destination.Return-Path: The location where non-send or bounce messages end up.Received-SPF: The Sender Policy Framework (SPF) forms part of the email authentication process that stops sender address forgery. ![]()
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