Receiving e-mails (POP3)

Troubleshooting — Solving typical problems of e-mail receiving.
Using secure login — Logging in the POP3 mail account using secure methods.
Learning the number of messages — Learning the number of messages in the mailbox.
Learning the total size of messages — Learning the total size occupied by all messages in the mailbox.
Downloading headers — Downloading the headers of the messages.
Detecting attachments — Detecting whether a message has any attachments without downloading entire message.
Downloading entire message — Downloading entire message.
Search for new messages — Skipping already downloaded messages and downloading only new ones.
Displaying a message — Downloading and displaying a message.
Deleting a message — Deleting a message from the mailbox.
Bounced messages (POP3 part) — Processing bounced messages.
Handling events — Tracking the progress of e-mail receiving and making user interface responsive while communicating with the POP3 server.