On 5/27/26 09:26, [email protected] wrote:
I'm not even sure what's the proper header, isn't it "From: "?

The specs are layered.

In a UNIX mbox format file you'll find both "From " and "From: " in each message.

RFC822 and its successors specify "From: ".

UNIX mbox format (which encapsulates one or more messages in a single file) starts each message with a line starting with "From " (with no : character), with sender and timestamp after the "From ".

On delivery to a mbox-format mailbox, some mailers will rewrite lines in the message starting with "From " to ">From " in order to prevent that line from being spuriously detected as the start of the next message.

If you're delivering messages fetched in mbox format into Cyrus, it's best to strip off a first line starting with "From " or ">From "; there's most likely a proper RFC822 "From: " header later on in the message headers.

                                       - Bill


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