The mailbox has to be able to store the address.

Answer The mailbox has to be able to store the address. RFC 6855 describes IMAP support for UTF-8. Storing an international address is not the same job as internationalizing a header, and it is not an opt-in. The document is RFC 6855, titled IMAP Support for UTF-8. That is a fact about mail software. It is not a solo ad price, a rank, or proof that a stranger opted in.

The note that started this: RFC 6855, IMAP Support for UTF-8, RFC 6855.

A rented send is one letter to someone else's list. Two jobs get collapsed in the sales pitch, and they are not the same job. One job is internationalizing a header. The other is the mailbox being able to store the international address. A seller who finished the header and invoices it as storage has bundled two tasks into one claim. A seller who finished storage and calls it an opt-in has bundled a third claim the document does not support. Unbundle them before you pay.

If you use solo ads for affiliate marketing, an address the mailbox can store is still not a person arriving at the offer. UTF-8 support is about storing the address, not about a click. Ask the separate question: can the mailbox store the address you are actually sending to? Then ask the order questions that remain: which list, which sending domain, which refund line. None of those is answered by a header that looks international.

What must the mailbox be able to do?

RFC 6855 describes IMAP support for UTF-8. The mailbox has to be able to store the address. Storing an international address is not the same job as internationalizing a header, and it is not an opt-in.

Store the address means the mailbox can hold that address. It does not mean the header work is done, and it does not mean the person asked for mail. A buyer who only checks the header can still be aiming at a mailbox that cannot store the address. A buyer who only hears that storage works can still be looking at a header that was not internationalized. Ask both, and do not let a yes on one stand in for a yes on the other.

The seller's matching duty is to stop at the job they actually did. If the mailbox can store the address, say that. If the header was internationalized, say that as a different sentence. If you do not know whether the mailbox can store the address, say you do not know. Do not borrow the other job to cover the gap. The buyer is about to pay for a letter to a list, not for a blurred claim about UTF-8.

• The mailbox has to be able to store the address.
• Storing an international address is its own job.
• That job is not the same as internationalizing a header.
• Neither job is an opt-in.

Is storing the address an opt-in?

No. The mailbox has to be able to store the address. That storage is not an opt-in. The document is RFC 6855, titled IMAP Support for UTF-8. That is a fact about mail software. It is not a solo ad price, a rank, or proof that a stranger opted in.

Storage is also not a price and not a rank. RFC 6855 does not say what a solo ad costs, and it does not sort senders into a ladder. A mailbox that can store an international address has a storage ability. The stranger who owns that address has not, by that fact, opted in. Proof of opt-in is not in the document. If the seller offers the ability as if it were the proof, decline the substitution. You can be glad the mailbox can store the address and still insist on knowing whose list you are mailing.

If you sell, do not put UTF-8 on the invoice as a consent feature. Put the letter, the list, and the sending domain on the invoice. Mention storage only as storage, and mention the header only as the header. Write the refund line for a send that was not that list or not that domain, and for a letter that was not the one approved. A stored address on the wrong list is still the wrong list. The extension will not argue your side.

What does the buyer still put on the order?

A buyer still has to name the list, the sending domain, and the refund line on the order. UTF-8 support does not name the list.

The list is whose addresses you meant. The sending domain is who will mail. The refund line is the agreement if storage, the header, or the send is not what you were told. The document can remind you that storage and the header are different jobs. It cannot fill in the names. A buyer who leaves with a UTF-8 demonstration and a blank order has not bought a solo ad. They have watched mail software.

Before you buy solo ads, ask the storage question and the header question as two questions, and then write the list down anyway. The mailbox has to be able to store the address. That is not an opt-in, not a price, and not a rank. Name the list, the sending domain, and the refund line, or do not pay.