Re: POP3 Connector : Lost messages
- From: Andrew Hodgson <me3@xxxxxxxxxxx>
- Date: Mon, 23 Jan 2006 23:22:28 +0000
On Mon, 23 Jan 2006 16:50:50 +0100, "Gislain" <nospam@xxxxxxxxxx>
wrote:
>Hi
>
>I'm french...
>
>On 2 server with SBS 2003 SP1, the POP3 connector (include in SBS) lost
>messages.
>
>Look my problem :
>. The mapping from the FAI email and Exchange is ok
>. The message are deleted at the FAI
>. In the event log, I read 1049 evt witch said that the message is mapped
>and delivered to the exchange account
>
>but...
>
>It's wrong.
>The message is not delivered in the exchange account,
>
>Could you help me ?
Probably, but it won't be the answer you are looking for.
The way that mail is delivered to servers usually is by SMTP. Think
of SMTP messages as being delivered to your house, in an envelope,
with the person's name clearly marked on the envelope. When you open
the letter, you can see the letter head, again with your information
on, and the body of the letter itself.
Now, POP3 was developed ultimately to get mail into the inbox of just
one address (i.e, you@xxxxxxxxxxxxxx with the username you). SMTP
servers deliver to POP mailboxes, and the POP mailboxes strip out all
the useful information, for easier retrieval for the client. This was
basically the envelope of the message, as it was just not needed, as
the postman had sorted it all out into the relevant boxes using the
SMTP services. In the mid nineties, someone had the bright idea of
creating a multiple user POP box, where they would put some
information on the letter head (they couldn't re-create the envelope
as the POP protocol did not support the retrieval of it). So, for
example, you@xxxxxxxxxxxxxx, me@xxxxxxxxxxxxxx, etc, would all get
delivered into the same mailbox.
Now, the issue is that when you get the email, you can usually see the
letterhead at the top (the header) with the to: and cc: line, and if
you are listed there, things generally work ok. However, what happens
if I send a letter to you with your name on the envelope, but don't
put your name in the letter head? This is a very posible situation,
because this happens when the user receives a message with his name in
the bcc: field, a mailing list or newsletter etc. The mail gets
delivered by the SMTP server (the postman) in the right multi-user
box, the envelope gets stripped, and now, the POP3 retriever cannot
know who the message is for. They may try and deliver this to the
person in the to: or cc: header, but this won't work as its not the
intended person. If the person in those headers is a local user, they
may get the email delivered to them twice.
Various extensions have been written to try and get this "envelope"
put back into POP3 messages, but all of them are a cludge, and none of
them are standard accross all implementations.
So the point I am trying to make is: Pop3 was never designed to be
used in this way, switch your mail to SMTP delivery if you can.
Andrew.
--
Andrew Hodgson in Bromyard, Herefordshire, UK.
My Email: use <andrew at hodgsonfamily dot org>.
.
- References:
- POP3 Connector : Lost messages
- From: Gislain
- POP3 Connector : Lost messages
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