Several names in From is still a header

Answer Several names in From is still a header. RFC 6854 updates the message format so group syntax can appear in the From header and the Sender header. A group can name more than one mailbox. The change is about what the header is allowed to contain. It does not appoint a responsible sender for your solo ad, and it does not invent a relationship with the reader.

The note that started this: RFC 6854, Group Syntax in the From and Sender Header Fields, RFC 6854.

You will see this in the wild as a From line that looks like a committee. A brand, a person, a role, maybe a list name, packed into one field. The line can be technically legitimate and still be useless to a buyer. If you are checking solo ad pricing, price the party who will answer when the mail goes wrong. A crowd in the header is not that party.

Older format rules wanted a single mailbox in From in ordinary cases, with Sender used when the agent doing the sending was not the author. The 2013 update, which is the document in front of us, relaxed the syntax so groups could be used. Relaxed syntax is not relaxed responsibility. Someone still submitted the message. Someone still authenticated a domain, or failed to. Someone still owns the complaint address.

Can a From header contain more than one mailbox?

RFC 6854 allows group syntax so the From header and the Sender header can carry more than a single mailbox. It is still a header. It does not decide who owes the reader an answer.

A header is a line the message carries so computers and people can read a claim. The claim might be who wrote the mail. The claim might be a group of authors. Readers, and the filters in front of them, still have to decide what to do with the claim. A buying desk should decide faster than a filter. Pick up the message, read the From line, and ask the seller to point at the human. If the answer is the group, ask which member of the group takes the reply.

Display names make this worse when they are decorative. A friendly first name next to a domain you have never seen is a costume. Group syntax can put several costumes on one line. Costumes are allowed. They are not identification. Identification is the domain that signed, the domain in the visible address you were told to expect, and the name on the invoice.

• One complaint address is named before the send.
• One authenticating domain is named before the send.
• Extra display names are labeled as extra.
• The invoice name and the From name are compared in writing.

Who is responsible for a solo ad when several names appear?

The buyer should still be able to name one party who accepts complaints and one domain that authenticated the mail. Several display names do not replace that party.

Responsibility is boring and that is why it works. The party has a name you can type into a refund request. The domain has a signature you can check on the received message. When several contractors touch a send, the buyer still needs a single throat to choke, in the polite sense of a single inbox that answers. Split responsibility is how a late send becomes everyone's job and no one's refund.

Ask in the order. Who is From, in one sentence, and who do I write when a reader complains about this creative? A seller who answers with a paragraph of brand names has not answered. Ask again. The second answer is the real one, or the absence of one.

Does a group From line change consent?

No. Consent is about the person who receives the mail and the person who mailed them. Extra names in the header do not create a relationship the reader never had.

A reader who joined one list did not join the other names you parked in the header for credibility. Borrowed authority is a common costume in this business. A known letter, a known face, a group that sounds like a newsroom. The reader owes none of those names their attention unless those names are who actually mailed them, with permission. Group syntax does not launder that.

RFC 6854 made a header more expressive. Use the expression to be clearer, or ignore it and stay with one mailbox. Either way, write down the one party. Several names are still a header. One name has to cash the check when the reader writes back.