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I have configured Windows Live Mail for my Gmail account. It uses IMAP for incoming and SMTP for outgoing mail. I collected packets recvd/sent by the application over a period of 4 hours using Netmon. I observed that the server every now or then sends a TLS packet of TCP payload length 39. I decrypted the packet and it contains:
* 554 EXISTS
Can anyone tell me what is going on?
I found the answer: The server is basically saying it has 554 messages. Each message is assigned a unique identifier. I have told Live Mail to check for new mail every 5 minutes and I indeed see see this packet every 5 minutes.