A signed multipart is not DKIM and not permission.

Answer A signed multipart is not DKIM and not permission. RFC 1847 describes security multiparts, including multipart/signed and multipart/encrypted. The document is titled Security Multiparts for MIME. A signed multipart wraps a signature around content. An encrypted multipart wraps the content so the bytes are hidden. A signature wrapped around content is not a domain signature and not permission to mail. A solo is one rented letter to someone else's list. The wrapper is not that letter, and it is not a yes from the reader.

Cream stationery and a teal accent on a dark navy desk — A wrapper on content is not permission.

The note that started this: RFC 1847, Security Multiparts for MIME, RFC 1847.

Sellers like the word signed because it sounds like trust. Trust in a wrapper is not trust in a file. If you are comparing best solo ad vendors, ask what signed refers to. If it refers to multipart/signed, you are looking at RFC 1847, not at DKIM. Permission is another job the wrapper does not do. Do not let one adjective finish a sale that still has no list.

That is a fact about mail software. It is not a solo ad price, a rank, or proof that a stranger opted in. Hiding the content, which is what multipart/encrypted does, does not create a request either. A person who cannot read the letter has not agreed to the offer inside it. This page will not describe encryption as a way to move mail. The encrypted form is a wrapper. Treat it as a wrapper.

What does RFC 1847 describe?

RFC 1847 describes security multiparts, including multipart/signed and multipart/encrypted. The document is titled Security Multiparts for MIME. A signature wrapped around content is not a domain signature and not permission to mail.

Keep signed and encrypted apart when you listen. Signed means a signature travels with the content. Encrypted means the content is hidden. Neither form names the list, and neither form is the sending domain on your order. A seller who shows the wrapper and stops has not finished the sale. Ask who joined. The security part cannot answer.

Buyers overpay when signed is allowed to mean careful. Careful is a list of people who asked, a domain you can write down, and a refund line if the drop is not that. A wrapper can sit on unwanted mail. Unwanted mail with a signature is still unwanted. Do not add money because the bytes were dressed.

Signed is not written down as DKIM.
Encrypted is not written down as permission.
The sending domain is on the order.
The refund line does not mention the wrapper as the product.

Is a signed multipart the same as DKIM?

No. A signed multipart is not DKIM and not permission. A signature wrapped around content is not a domain signature and not permission to mail. Treat the wrapper as a wrapper. Do not treat it as a domain signature, and do not treat it as a yes from the reader.

The buyer consequence is paying for the wrong signature. You wanted the sending domain on the order to be the domain that sent. You were shown a signature wrapped around content. Ask for the domain by name on the order, and read it on a copy you receive. Do not ask the wrapper to stand in. The document does not call that wrapper a domain signature.

The seller consequence is a claim you cannot sort when the buyer asks which signature. If you say signed, say which kind. If you only have multipart/signed, do not add DKIM in the same breath. If you only have multipart/encrypted, say the content is hidden, not that the reader agreed. Permission is still a fact about the list.

Does a security multipart prove a stranger opted in?

No. That is a fact about mail software. It is not a solo ad price, a rank, or proof that a stranger opted in. A buyer still has to name the list, the sending domain, and the refund line on the order.

A wrapper can sit on content the reader never asked to see. This page will not explain how to build that wrapper. You do not need the construction to refuse the swap. The swap uses a security multipart as a stand-in for a person who joined. The person is the product. The part is not.

Name the list before you admire the part. safe solo ads sellers can say who receives the letter and which domain sends it. RFC 1847 will not say it. A signed multipart is not DKIM and not permission. Buy the letter if the order names the file. Do not buy the wrapper.