Have you had experience interacting with the IMAP protocol when working with mailboxes?

Yes, when working with mailboxes, the IMAP (Internet Message Access Protocol) is often used to access emails on the server without the need to download them. In Go, there are several libraries, such as go-imap, that allow connecting to an IMAP server, authenticating, retrieving a list of emails, reading their content, marking emails, etc.

Example of a simple connection and fetching a list of emails using go-imap:

package main

import (
    "log"
    "github.com/emersion/go-imap/client"
    "github.com/emersion/go-imap"
)

func main() {
    // Connect to the IMAP server
    c, err := client.DialTLS("imap.example.com:993", nil)
    if err != nil {
        log.Fatal(err)
    }
    defer c.Logout()

    // Authenticate
    if err := c.Login("username", "password"); err != nil {
        log.Fatal(err)
    }

    // Select the INBOX mailbox
    mbox, err := c.Select("INBOX", false)
    if err != nil {
        log.Fatal(err)
    }

    // Get the last 10 emails
    from := uint32(1)
    to := mbox.Messages
    if mbox.Messages > 10 {
        from = mbox.Messages - 9
    }

    seqset := new(imap.SeqSet)
    seqset.AddRange(from, to)

    messages := make(chan *imap.Message, 10)
    done := make(chan error, 1)
    go func() {
        done <- c.Fetch(seqset, []imap.FetchItem{imap.FetchEnvelope}, messages)
    }()

    for msg := range messages {
        log.Println("Subject:", msg.Envelope.Subject)
    }

    if err := <-done; err != nil {
        log.Fatal(err)
    }
}

This experience allows you to work efficiently with email at the IMAP protocol level.