[Dovecot] Getting two mails.....

[Steffen Kaiser]

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On Thu, 22 Nov 2007, Nikolay Shopik wrote:

>> evaluate to the same mailbox. But to detect two deliveries in two separate 
>> mails is another problem and, because MessageIDs are not as globally unique 
>> as they should, there is no fail-proof method in order to detect them.
>> 
> Well in case for example dovecot mail list when you reply by pressing reply 
> all, it generate same message-id for these two messages. Anyway I'm agree 
> with you, we can't be sure for all such cases.

The message ID is to be created by the sender, hence, is should be the 
same for both mails. (If the ID is added by a MTA, it's a SPAM indicator 
;-) )

But although message IDs are required to be "globally unique" by RFC, it's 
a piece of data created by plenty of individual MUAs, bulk mailers, 
selfmade scripts etc.pp. Each implement a different strategy to acquire 
the "global uniqueness" (e.g. by putting together local hostname, mail 
domain, current time). But no such method is really fail proof.
And at least - it is data any user can fake.

Bye,

- -- 
Steffen Kaiser
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