9.119.18 on page
1106):
O Timeout.queuereturn.urgent=1d
O Timeout.queuereturn.normal=2d
O Timeout.queuereturn.non-urgent=4d
Here, a Priority: header of normal will cause the message containing it to bounce after it
has remained in the queue for two days.
The Priority: header should never be declared in the configuration file.
25.12.30 Received:
Trace routing of mail RFC2822
The Received: header is used to record information about every site a mail message passes
through on its way to ultimate delivery. First this header is inserted by the original sending
site, then another is added by each site that the message passes through, including the site
performing final delivery. Each new header is added to the list of Received: headers,
forming a chronological record (reading bottom up through the headers) of how the mail
message was handled.
The contents of the Received: header??™s field are narrowly defined by RFC2821. The field??™s
defined form looks like this:
Received: "from" host "by" host ["via" atom] ["with" atom]
["id" string] ["for" addr] ";" date
?†‘
whitespace
The field is composed of six items that can be split over multiple lines by using whitespace
to indent the second line. Each item is composed of two parts: a word (shown in quotation
marks) and a value. Optional items are indicated by the enclosing square brackets in the
previous example, but those brackets are not a part of the item and must be excluded when
the item is actually used.
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