(Go) Process New Email by Scanning for Senders

Scan email and save application-selected emails to EML files with unique filenames.

Note: This example requires Chilkat v11.0.0 or greater.

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    success := false

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    imap := Imap_Ref.html">chilkat.NewImap()

    // Connect to an IMAP server.
    // Use TLS
    imap.SetSsl(true)
    imap.SetPort(993)
    success = imap.Connect("imap.someMailServer.com")
    if success == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    // Login
    success = imap.Login("myLogin","myPassword")
    if success == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    // Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox")
    if success == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        return
    }

    // We can choose to fetch UIDs or sequence numbers.
    fetchUids := true

    // Fetch messages from the mailbox using a search criteria.
    // This example finds NEW emails: these are emails that have the RECENT flag set, but not the SEEN flag:
    messageSet := MessageSet_Ref.html">chilkat.NewMessageSet()
    success = imap.QueryMbx("NEW",fetchUids,messageSet)
    if success == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        messageSet.DisposeMessageSet()
        return
    }

    // This example will download headers, and then download
    // the full email for those emails sent from a contact
    // in our database.

    // When downloading headers, each email object contains
    // (obviously) the headers, but the body will be missing.
    // Also, attachments will not be included.  However, it is
    // possible to get information about the attachments
    // as well as the complete size of the email.
    bundle := EmailBundle_Ref.html">chilkat.NewEmailBundle()
    headersOnly := true
    success = imap.FetchMsgSet(headersOnly,messageSet,bundle)
    if success == false {
        fmt.Println(imap.LastErrorText())
        imap.DisposeImap()
        messageSet.DisposeMessageSet()
        bundle.DisposeEmailBundle()
        return
    }

    // Loop over the email objects...
    emailHeader := Email_Ref.html">chilkat.NewEmail()
    fullEmail := Email_Ref.html">chilkat.NewEmail()
    i := 0
    numEmails := bundle.MessageCount()
    for i < numEmails {
        bundle.EmailAt(i,emailHeader)

        // The sender's email address and name are available
        // in the From, FromAddress, and FromName properties.
        // If the sender is "Chilkat Support <support@chilkatsoft.com",
        // then the From property will hold the entire string.
        // the FromName property contains"Chilkat Support",
        // and the FromAddress property contains "support@chilkatsoft.com"
        fmt.Println(emailHeader.From())
        fmt.Println(emailHeader.FromAddress())
        fmt.Println(emailHeader.FromName())

        // Assume at this point your code checks to see if the sender
        // is one in your contacts database.  If so, this is
        // the code you would write to download the entire
        // email and save it to a file.

        // The ckx-imap-uid header field is added when
        // headers are downloaded.  This makes it possible
        // to get the UID from the email object.
        uidStr := emailHeader.GetHeaderField("ckx-imap-uid")
        uid := int(*uidStr)

        success = imap.FetchEmail(false,uid,true,fullEmail)
        if success == false {
            fmt.Println(imap.LastErrorText())
            imap.DisposeImap()
            messageSet.DisposeMessageSet()
            bundle.DisposeEmailBundle()
            emailHeader.DisposeEmail()
            fullEmail.DisposeEmail()
            return
        }

        // You can use the GenerateFilename method to
        // generate a unique filename...
        filename := fullEmail.GenerateFilename()

        // SaveEml saves the entire email, including attachments.
        success = fullEmail.SaveEml(*filename)

        fmt.Println("--")

        i = i + 1
    }

    // Disconnect from the IMAP server.
    success = imap.Disconnect()

    imap.DisposeImap()
    messageSet.DisposeMessageSet()
    bundle.DisposeEmailBundle()
    emailHeader.DisposeEmail()
    fullEmail.DisposeEmail()