On 6/11/2012 8:22 AM PT, Jonathan Kamens typed:
SeaMonkey (and Thunderbird) fill in the Date header on a
message when you do the File> Send Later command. According
to the RFCs, the Date header is supposed to indicate the
date-time at which the user indicated that the message was
ready to be transported, not the date-time at which the
message actually _is_ transported, so SeaMonkey's behavior is
(in my opinion, and clearly also in the opinion of its
developers ;-) correct.
At the recipient's end, the mail user agent can choose to
display either the date-time in the Date header, or the
date-time when the message was received. Most of the time,
they are within seconds of each other, so it doesn't really
matter which one you look at, but there are three exceptions:
1. A message is delayed en route for one of any number
of reasons.
2. A message is delayed because the user didn't send it right
away, e.g., because he was offline when writing it and didn't
send it until going online later.
3. A message has the wrong date in the Date header, either
because the sender's clock is set improperly on his computer,
or because the sender has inserted an incorrect Date header
on purpose (a frequent occurrence with spam).
Some software displays Date by default but allows the receive
date-time to be displayed instead or in addition; some
software displays the receve date-time by defeault but allows
the Date to be displayed instead or in addition; and some
software displays only one and doesn't allow the other.
The risk of displaying Date instead of Received is if you sort
your inbox by Date and somebody sends you a message with an
incorrect, old Date value, it may get buried earlier in your
inbox and you might miss it. Aside from that, for the vast
majority of users it doesn't make much of a difference which
one is displayed.
Thanks! :)
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