I've seen this on an email received from Belgian tax administration.
The from field is composed of two email addresses:
And in between these two "senders", "de la part de" (French) which would probably be written "on the part of" in English but I haven't found any other exemple (whatever the language).
So I'm curious to know how to organize email header to achieve this result, but once again I haven't found anything about. Or maybe I haven't google it properly...
Listing several mailboxes in the From
header field is valid according to RFC 5322 :
The from field consists of the field name "From" and a comma-separated list of one or more mailbox specifications. If the from field contains more than one mailbox specification in the mailbox-list, then the sender field, containing the field name "Sender" and a single mailbox specification, MUST appear in the message.
If you want a more detailed analysis, post the headers of the raw message rather than a screenshot.
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