A mail client naming itself is not authentication.

Answer A mail client naming itself is not authentication. RFC 2971 describes an IMAP ID command a client can use to identify the software. Identification is not a login and not consent. The document is RFC 2971, titled IMAP4 ID extension. The command lets software offer a name. A name is a label the program speaks. It is not a check that a person is who anyone claims, and it is not a yes to your letter. A seller who treats the label as proof of a reader has confused a name tag with a credential.

The note that started this: RFC 2971, IMAP4 ID extension, RFC 2971.

Pricing conversations go bad when a software name is offered as evidence the list is real. Evidence of a program is not evidence of a person. Before a quote hardens, read solo ad pricing as a talk about one letter, a list, and a domain. An ID command is none of those. If the quote leans on what the mail client calls itself, you are being asked to pay for a label. Labels are cheap. Lists are the product, and only when they are actually lists.

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 client's self-name is not your sending domain. Write that distinction on the order if a seller keeps mixing them. A refund line that mentions a software label sold as authentication will save you from a philosophical argument later. You will not need to define authentication. You will need to point at the sentence.

What does the IMAP ID command do?

RFC 2971 describes an IMAP ID command a client can use to identify the software. Identification is not a login and not consent. The document is RFC 2971, titled IMAP4 ID extension.

Identify the software means the program can say what it is. It does not mean the person at the mailbox has proved anything to you. You are not in that exchange. A seller who shows you a software name from a client is showing you a remark the program made to a server. The remark is not the letter you approved, and it is not the list you are renting. Thank the remark for its honesty about the program, then ignore it as a reason to pay. Honesty about a program is a low bar.

• A client name is not called authentication.
• Identification is not described as a login or as consent.
• The list, the sending domain, and the refund line are named.
• The software label is not the sending domain on the order.

Is a client naming itself authentication?

No. A mail client naming itself is not authentication. A software name is a label. A label is not a login, and it is not consent to be mailed.

Login is a check. Consent is a history. A label is neither. Anyone can ship a program that speaks a name, including a name you have heard of and trust for other reasons. Trust in a program is not trust in the stranger who uses it, and it is not trust in the seller who mailed you a screenshot of the name. Screenshots of labels are how thin files get a technical accent. Accent is not proof. Ask for the list in words that do not include the program name.

If you sell solos, take the label out of your proof folder. Buyers who know this document will hear the mistake immediately. Buyers who do not will still feel the gap when they ask who opted in and you answer with software. Answer with the list. If you do not have the list, do not take the order. A command for identifying software will not grow a list while you talk. It will only decorate the talk.

Does a software name prove opt-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.

A program announcing itself is not a buyer announcing interest. The announcement does not record consent, does not rank the file, and does not set a price. A stranger who never asked for mail can use a client that names itself clearly. Clarity of the name is irrelevant to the stranger's choice. Do not let a clean label feel like a clean list. Clean lists are explained in ordinary language: who joined, on what domain the mail goes out, and what the refund line says if that story was wrong.

Judge vendors by whether they can leave the label alone. That is a fair test on best solo ad vendors. A mail client naming itself is not authentication. Name the list, the sending domain, and the refund line before you pay. A software name is not a login, not consent, and not the letter you think you are buying.