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return path - When the email is put in the recipient's email box, a new mail header is created with the name "Return-Path:" containing the address on the MAIL FROM command. Earlier forms of email (such as UUCP ) would require information about each "hop" along the path that the email traveled to reach the destination, hence the "path" part of ...
Variable envelope return path (VERP) is a technique used by some electronic mailing list software to enable automatic detection and removal of undeliverable e-mail addresses. It works by using a different return path (also called "envelope sender") for each recipient of a message.
For example, the Delivery Status Notification extension defined in RFC 3461 requires a null return path when sending email with a "NOTIFY=NEVER" option to a non-conforming server. Some e-mail bounces (incorrectly) get sent not to the return address, but to the e-mail address on the From: header.
To be an effective anti-phishing tool, the MUA (Mail User Agent or Mail Client) will need to be modified to display either the pra for Sender ID, or the Return-Path: header field for SPF. The pra tries to counter the problem of phishing, while SPF or mfrom tries to counter the problem of spam bounces and other auto-replies to forged Return ...
The MDA also removes bogus Return-Path header fields inserted by other MTAs; this header field is generally guaranteed to reflect the last reverse path seen in the MAIL FROM command. Today these paths are normally reduced to ordinary email addresses , as the old SMTP ' source routing ' was deprecated in 1989; for some historical background info ...
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If the email is bounced, a message is sent to this address, [2] and for downstream transmission it typically appears in the "Return-Path" header. To authenticate the email address which is actually visible to recipients on the "From:" line, other technologies such as DMARC must be used. Forgery of this address is known as email spoofing, [3 ...
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