----- Original Message -----
From: "Douglas Otis" <[EMAIL PROTECTED]>
To: "Hector Santos" <[EMAIL PROTECTED]>

>> That basically means that x= must be used if there is a planned event
>> for selector removal within 7 days.
>
> When the transport includes IMAP and POP, this 7 day advice is far
> too short of a period to ensure verification.

Agreed. This SWAG must be from the recommended SMTP retry limits:

| RFC 2821:
| 4.5.4.1 Sending Strategy
|
|  ...
|
|  Retries continue until the message is transmitted or the sender gives
|  up; the give-up time generally needs to be at least 4-5 days.  The
|  parameters to the retry algorithm MUST be configurable.


But for the time-shifted application, if the message reception time
(Received: header) is used, then it shouldn't matter.

Just consider that in a offline MUA like Outlook, where it shows two
possible dates in its message list,  the dates are from:

  Sent: Column  <-- Date: Header
  Received: Column <-- Topmost Received: Header (ISP MDA timestamp)

The MUA (today) only understands these two dates.  Why would it want to use
the current time for a DKIM plug-in?   That doesn't make sense.   You want
to emulate the idea of real time reception so you would use the MDA
reception time.  Not the pick up time.

---
Hector


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