The list header is the exit a solo ad has to show

Answer A solo ad should carry a List-Unsubscribe header on the domain that sends it. RFC 2369 defined that header in July 1998. It is not a new rule, and it is not optional courtesy. A seller who cannot show the header is hiding the door on the list you are about to rent.

The note that started this: RFC 2369: The Use of URLs as Meta-Syntax for Core Mail List Commands, IETF, July 1998.

Yesterday's note was about the newer one-click signal. This one is the older beam under it. You can have a visible footer and still fail both. You can have the 1998 header and still fail one-click. Knowing which piece is missing tells you whether the seller is sloppy or simply stuck on an old stack. Both are reasons to slow the payment down. They are not the same repair.

RFC 2369 is the note that started this, and it is old. The standard describes a small set of list headers so a mail program can find the commands a list is supposed to offer. List-Unsubscribe is the one that matters on a commercial send. The value is an address: a web address, a mailto, or both. The idea is that leaving the list is a named command, not a secret. List-Help, List-Owner, and the other headers in that document are the rest of the front desk. List-ID, the name of the list itself, lives in a later document. Do not mix them up when a seller waves at "the headers" as if they were one switch.

What does the List-Unsubscribe header do?

RFC 2369 lets a message carry a List-Unsubscribe address, either a web address or a mailto, so a person or their mail software can find the command to leave.

That is the whole invention. The command is in a place software can see, not only in a sentence at the bottom of a designed email that a text-only view might mangle. When the header is present and honest, the mailbox can offer a control. When it is absent, the mailbox has less to offer, and the person is left with the buttons that always exist: delete, and spam.

A header that points at a dead page is not a header that works. Click it on a test message. If the page errors, or demands a login the reader does not have, the command is theater. Sellers who want the rent to continue should walk that path on the domain in the quote, this week, not after the first complaint thread.

Is List-Unsubscribe the same as one-click unsubscribe?

No. RFC 2369 is the older header that names the command. One-click, defined later, is a specific HTTPS POST. A list can have the older header and still lack the one-click signal.

Keep the two questions separate when you review a quote. First, is List-Unsubscribe present on a message from the sending domain. Second, does that message also carry the one-click signal, so the mailbox can POST instead of sending the reader through a page. A seller who answers "we have an unsubscribe" has answered neither question. Ask them to show the header block.

This post cites only the 1998 standard, so it will not borrow a mailbox provider's bulk-sender numbers from a different page. The standard is enough. A list command that software can find is the minimum description of an exit. Safe solo ads sellers can paste the header into the thread. You can compare it to the domain you are paying.

What should you ask a solo ad seller about the exit?

Ask them to show the List-Unsubscribe header on a real message from the domain that will send your ad, before you pay.

Not a template from their help desk. A message. The domain in the from-line should be the domain that will carry your offer. If they send the sample from a different name, you have not seen the asset you are renting. You have seen a demo.

Write the result into the order. If the header is missing on the live send, the order is not what you bought. Buy solo ads from a file that already lets people leave, because the people who stayed are the only audience a guest email deserves.