
the connection dropped and no QUIT command was received), the messages downloaded during the session won't be marked as popped.Īfter your client downloads the messages, it asks Gmail for a list of messages again. Gmail will again provide a list of the next oldest 250 conversations that haven't been popped yet. This means that once a message is downloaded by the POP client, if the POP session ends normally (with the QUIT command), Gmail will mark the message as popped (and it will no longer appear when POP clients get the list of message) - even if the client didn't explicitly specify the DELE command after downloading the message. Gmail considers messages as downloaded once they've been downloaded using the RETR command (as explained in the protocol documentation). If however, your mail client crashes unexpectedly, the message will be re-downloaded. Regardless of which behavior you select, any downloaded message will be marked internally as 'popped' and will not be downloaded again.

What happens to my messages in Gmail after they've been popped?

Because a conversation in Gmail can consist of more than one message, your mail client will probably download more than 250 individual messages.

Why "about 250" messages? When your POP client asks Gmail for the list of messages, Gmail retrieves the oldest 250 conversations that haven't been popped yet.
