A child mailbox is not a sub-list you bought.

Answer A child mailbox is not a sub-list you bought. RFC 3348 describes an IMAP extension for child mailboxes. The document is RFC 3348, titled The Internet Message Action Protocol (IMAP4) Child Mailbox Extension. A folder under a folder is a place the mail program keeps messages. It is not a rented segment of people, and it is not the letter a solo ad is supposed to be. You can nest folders all afternoon and still have no audience.

Cream stationery and a teal accent on a dark navy desk — A nested place for mail is not a group of buyers.

The note that started this: RFC 3348, The Internet Message Action Protocol (IMAP4) Child Mailbox Extension, RFC 3348.

People sell a folder name as if the name were a slice of a list. A child mailbox is still a mailbox. The people, if any, are whoever the list owner already has, and the folder does not create them. If you are about to buy solo ads, ask to see the list name on the order, not a picture of folders. A picture of folders is how a file tree gets sold as a segment.

That is a fact about mail software or about an old specification. 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. The child mailbox extension fills none of those blanks. A seller who opens with the specification and never names the list is handing you a public document and calling it a product. Read the document if you want. Pay only for the order.

What does RFC 3348 describe?

RFC 3348 describes an IMAP extension for child mailboxes. The document is RFC 3348, titled The Internet Message Action Protocol (IMAP4) Child Mailbox Extension. A folder under a folder is not a rented segment.

A folder under a folder is how a person organizes mail already on hand. It can hold newsletters, receipts, or nothing at all. The specification gives mail software a way to talk about that nesting. It does not say who may be written to, and it does not say they asked. A seller who points at a child folder and calls it the buyers is renaming a drawer.

Ask what lives in the folder before you treat the name as inventory. If the seller cannot show the list behind the folder, you are buying a label. Labels are cheap to invent and expensive to discover after the letter goes out. Keep the label on the desk until the order names real things: the list, the sending domain, and the refund line. A rented send is still one letter to someone else's list. A nested folder is not that letter, and it is not permission.

The order names a list, not a folder tree.
The seller can say who is on that list.
The sending domain is written down.
The refund line covers a folder sold as a segment.

Is a child mailbox a sub-list you bought?

No. A child mailbox is not a sub-list you bought. A folder sitting under another folder is a place mail software keeps messages. It is not a segment of people who asked for your offer.

A sub-list, when a seller uses the word honestly, is a named group of people the order can point at. A child mailbox has a parent folder and a name. Those are software facts. They do not become a group of buyers because someone indented the name. If the pitch says the child folder is the buyers, ask where the buyer file is, and ask to see that it matches the order.

You can still buy a real segment. You do not buy it from this document. The document tells mail programs how to refer to a folder that lives under another folder. Your creative still has to be one letter. If you have already paid and the segment was only a nested mailbox, the refund line is the next sentence, not a tour of the file tree. A careful seller would rather lose the order than rename a folder as a list.

Does a child mailbox prove the reader opted in?

No. That is a fact about mail software or about an old specification. It is not a solo ad price, a rank, or proof that a stranger opted in.

Opt-in is a history between a list owner and a person. A folder has no history with anyone. A stranger who never asked can have mail filed in a tidy child mailbox, and the tidiness will not make the stranger yours. It will not hand you a rank, and it will not set a price. Ask who is on the list. Ask which domain sends. Ask what the refund line says when the folder was sold as a segment, or when the list is not the list you named.

Price the object in your hand. A child mailbox is a folder under a folder. A solo is one letter to someone else's list. Read that difference before you argue about solo ad pricing. Pay for the letter only after the order names the list, the sending domain, and the refund line. A document about nested folders is not the invoice, and it is not the audience.