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At 16:51 19/10/2015 -0400, Charles Marcus wrote:
On 10/18/2015 6:44 PM, Brian Barker wrote:
At 15:27 17/10/2015 -0700, James E. Lang wrote:
POP3 is a protocol that downloads the messages to you without leaving a copy on the server.

What gives you this mistaken impression?

It isn't mistaken, it is fact.

Sorry, but it's not a fact.

Yes, the POP3 protocol was later amended to provide for optional capabilities like leaving messages on the server, ...

So you are saying it's not a fact but it's nevertheless true? There must be a name for style of argument where you claim something to be false and promptly explain that it is true! It's certainly not logic. (And there's no "later" involved: the sole protocol mentioned was POP3.)

POP3 has RETR to retrieve a message and *separately and optionally* DELE to delete the server copy. Even the original POP had the alternatives RETR to read messages and RDEL to read them and delete them - so there is no "later" about it.

... and most clients have such options, ...

If you see above, you will see that the claim was about the protocol, not clients that may use it. That claim - that Post Office Protocol cannot leave copies on servers - was the only (untrue) claim I described as mistaken.

... but this is error-prone, ...

Again, the point was not about advisability of using POP.

In the early days of use of the POP protocol, server space would have been at a premium and no doubt common and necessary practice was for clients to be configured to delete server copies of messages when they were downloaded. But that doesn't mean that "POP3 ... downloads ... without leaving a copy on the server."


Brian Barker

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