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Go

Fetch a Set of POP3 Messages by UIDL

See more POP3 Examples

Demonstrates the Chilkat MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are listed in a StringTable and appends them to an EmailBundle. The arguments are the UIDL StringTable, headersOnly, numBodyLines, and the EmailBundle. This example fetches two specific messages by UIDL.

Background: This is the efficient way to download a selected subset of a mailbox in one call — exactly the pattern for an incremental client: list the mailbox UIDLs, compare against the ones you've already stored, and fetch only the new UIDLs as a set. It avoids re-downloading messages you already have while still pulling everything new in a single operation.

Chilkat Go Downloads

Go
    success := false

    //  Demonstrates the MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are
    //  listed in a StringTable and appends them to an EmailBundle.  The arguments are the UIDL
    //  StringTable, headersOnly, numBodyLines, and the EmailBundle.  The messages remain on the
    //  server.

    mailman := chilkat.NewMailMan()

    //  Configure the POP3 server connection.
    mailman.SetMailHost("pop.example.com")
    mailman.SetMailPort(995)
    mailman.SetPopSsl(true)
    mailman.SetPopUsername("user@example.com")
    mailman.SetPopPassword("myPassword")

    //  Build the set of UIDLs to fetch.
    uidls := chilkat.NewStringTable()
    uidls.Append("0000000123abcdef")
    uidls.Append("0000000124abcdef")

    //  Fetch the listed messages (full bodies) into a bundle.
    //  headersOnly=false (fetch the entire message).
    //  Note: numBodyLines only applies when headersOnly is true (it sets how many lines of the
    //  body to include along with the headers).  When headersOnly is false, the entire message
    //  is fetched and numBodyLines is ignored.
    bundle := chilkat.NewEmailBundle()

    success = mailman.FetchUidlSet(uidls,false,0,bundle)
    if success == false {
        fmt.Println(mailman.LastErrorText())
        mailman.DisposeMailMan()
        uidls.DisposeStringTable()
        bundle.DisposeEmailBundle()
        return
    }

    n := bundle.MessageCount()
    fmt.Println("Fetched ", n, " messages.")

    email := chilkat.NewEmail()
    var i int
    for i = 0; i <= n - 1; i++ {
        success = bundle.EmailAt(i,email)
        fmt.Println(email.Subject())
    }

    //  Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
    //  connects and authenticates -- using the property settings above -- whenever a server
    //  operation requires it.  Calling the explicit connect/authenticate methods can still be
    //  helpful to determine whether a failure occurs while connecting or while authenticating.

    mailman.DisposeMailMan()
    uidls.DisposeStringTable()
    bundle.DisposeEmailBundle()
    email.DisposeEmail()