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Thus, it defines the mail envelope and its parameters, such as the envelope sender, but not the header (except trace information) nor the body of the message itself. STD 10 and RFC 5321 define SMTP (the envelope), while STD 11 and RFC 5322 define the message (header and body), formally referred to as the Internet Message Format.
Registered mail is a postal service in many countries which allows the sender proof of mailing via a receipt and, upon request, electronic verification that an article was delivered or that a delivery attempt was made. Depending on the country, additional services may also be available, such as:
Systems that implement greylisting work fine with VERP if the envelope sender follows the above-mentioned format. However, some VERP implementations use message number or random key as part of VERP, which causes each post to the mailing list to be delayed unless the greylisting system treats "similar" sender addresses as being equivalent.
For informal letters, follow the same format as the sender's address. If sending a letter to someone at a specific business, the first line should be the company's name. In the next line, follow ...
Sender places the letter in an envelope on which the recipient's address is written on the front of the envelope, or often is visible through a transparent window of the envelope. Sender ensures that the recipient's address includes the ZIP or Postal Code (if applicable) and historically often included their return address on the envelope.
Envelope with return address in top left corner. In postal mail, a return address is an explicit inclusion of the address of the person sending the message. It provides the recipient (and sometimes authorized intermediaries) with a means to determine how to respond to the sender of the message if needed.
Ordinarily, the bounce address is not seen by email users and, without standardization of the name, it may cause confusion. If an email message is thought of as resembling a traditional paper letter in an envelope, then the "header fields", such as To:, From:, and Subject:, along with the body of the message are analogous to the letterhead and body of a letter - and are normally all presented ...
Enforce submission rights guarantees that the envelope sender address is valid and authorized with the used authentication. This in essence complies with the SPF model specified in RFC 7208. May add sender permits to add a Sender address header field if the envelope sender address does not match any author address in the "From" header field.