Hello I Am writing Pop3 client for gmail. The problem is that when the email is downloaded then it deletes from pop3 server. I have tried sending RSET command to server but it dose not work.
Do i have to send RSET just before disconnecting or after downloading each mail?
Google doesn't handle POP3 in a conventional sense. Once you have downloaded a mail then it is flagged as downloaded and POP3 will act like it has been deleted. But in reality they keep a copy of the mail on the server.
Gmail's POP3 configuration maybe sometimes confusing. In the Gmail's web interface in "Settings" on "Forwarding and POP/IMAP" tab you can find a drop down list called "When messages are accessed with POP".
Here's the value list and the Gmail's behavior:
a. "delete Gmail's copy": Message is deleted by issuing RETR command.
b. "keep Gmail's copy in the Inbox": Message stays in the Inbox, Web interface says it's unread, however message is not received for the second time using POP3 client.
c. "archive Gmail's copy": Message is deleted by issuing RETR command, however it is possible to find it using web interface.
Gmail simply ignores DELE command, and does not follow POP3 standard.