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Re: [Nmh-workers] nmh in near, medium, and far-term

From: Earl Hood
Subject: Re: [Nmh-workers] nmh in near, medium, and far-term
Date: Fri, 9 Dec 2011 17:58:28 -0600

On Fri, Dec 9, 2011 at 5:25 PM, Jeffrey Honig <address@hidden> wrote:

> I have my fetchmail scripts ignore messages with a duplicate messageid
> (using a history of messageids I've received during the last 30 days or so)
> to avoid duplicate mail.

Depends on what you mean by "duplicate".  From a mail archiving perspective,
you can have multiple messages with same message ID, but can be considered
different messages, even if the "content" is the same.

Example: Mail that is sent to individuals and mailing list(s).  Mailing
lists typically add additional headers (e.g. List-*) and custom footers,
so the message that is received by list subscribers is not identical
to versions received directly from the original sender.

> It is probably too much to assume that everyone would not have duplicate
> copies of a message with the same messageid.  Some people may have valid
> reasons for this.

Archiving messages to mailing lists is a valid reason.

> And there may be messages w/o a message-id.

This is the case for draft messages in nmh.


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