Email - Wikipedia

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Return-Path: after the delivery SMTP server makes the last delivery of a message, it inserts this field at the top of the header. Other fields included on top of the header by the getting server may be called trace fields. Authentication-Results: after a server verifies authentication, it can conserve the lead to this field for consumption by downstream representatives.

DKIM-Signature: shops results of Domain, Keys Identified Mail (DKIM) decryption to verify the message was not changed after it was sent. Auto-Submitted: is used to mark automatic-generated messages. VBR-Info: claims VBR whitelisting Message body Content encoding Web e-mail was designed for 7-bit ASCII. Most email software is 8-bit clean, but need to assume it will communicate with 7-bit servers and mail readers.

The 8BITMIME and BINARY extensions were presented to allow transmission of mail without the requirement for these encodings, however lots of mail transport representatives may not support them. In  IM Hotshot , e-mail software application violates 5322 by sending out raw non-ASCII text and a number of encoding schemes co-exist; as an outcome, by default, the message in a non-Latin alphabet language appears in non-readable form (the only exception is a coincidence if the sender and receiver utilize the very same encoding scheme).

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HTML e-mail messages frequently include an automatic-generated plain text copy for compatibility. Advantages of HTML consist of the ability to include in-line links and images, distinguished previous messages in block quotes, wrap naturally on any display screen, use focus such as underlines and italics, and change typeface styles. Downsides consist of the increased size of the email, privacy concerns about web bugs, abuse of HTML email as a vector for phishing attacks and the spread of malicious software.

Some Microsoft e-mail customers may permit rich format using their proprietary Rich Text Format (RTF), however this ought to be prevented unless the recipient is ensured to have a compatible email client. Servers and customer applications Messages are exchanged between hosts using the Easy Mail Transfer Procedure with software application called mail transfer agents (MTAs); and delivered to a mail shop by programs called mail shipment representatives (MDAs, also in some cases called regional delivery representatives, LDAs).