Hello everybody,
on Sonntag, 24. März 2019 at 09:07 Thomas Fernandez <[email protected]>
wrote
re Re-downloading all the mails
It happens with automatic download, I hardly ever use F2. Only on the laptop
that I travel with, not the PC at home.
Isn't the status "READ" of each message stored in the POP3 client, and not
the POP3 server?
Then your laptop have a different list of "new" messages than your desktop
PC.
As far as I can see, the POP3 server does not keep a status VIEWED.
The POP3 server's response to the client's LIST command is the "scan listing"
which
"consists of the message-number of the message, followed by a single space
and the exact size of the message in octets."
The "message-number" is a sequential number of all messages in a "maildrop"
assigned anew for each session, beginning with 1.
This message number is referred to in the RETR (retrieve) and DELE (delete)
commands from the client.
Using the option command UIDL, the client can retrieve a list of unique ids
a single message identified by message-number or all messages, with the
UNIQUE-ID being a
arbitrary server-determined string, consisting of one to 70 characters in the
range 0x21 to 0x7E, which uniquely identifies a message within a maildrop and
which persists across sessions.
If the POP3 client keeps track of those UNIQUE IDs, it can be sure not to
re-download messages already seen.
As I said, I can't see a way the POP3 server could keep a list of
messages wich are "new" for this POP3 account. It is only the POP3 client can
know, which has to keep track of which messages have already been seen, but
kept on the server.
So, when several different POP3 clients access the same mail store, they do
not have the same idea about what is a message already viewed, and which is
not.
Several different POP3 clients would have to synchronise the list of UNIQUE
IDs in order to consider the same messages as "NEW" or "VIEWED".
My suggestion:
a) on the desktop, keep the number of days you keep messages on the server
relative small;
b) on the laptop (I guess that you have activated the option "keep ALL
messages on the server") use the mailbox inspector to retrieve messages, maybe
activate the option "activate mailbox inspector automatically for every
retrieve".
PS: RFCs on POP3 : https://www.rfc-editor.org/info/std53
Cheers,
Lüko Willms
Frankfurt am Main
Germany
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