(VB.NET) How to Copy IMAP Mail to another IMAP Server

Demonstrates how to copy the entire contents of an IMAP mailbox to another IMAP server.

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

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

Dim imapSrc As New Chilkat.Imap

' Connect to our source IMAP server.
Dim success As Boolean = imapSrc.Connect("imap.someMailServer.com")
If (success <> True) Then
    Debug.WriteLine(imapSrc.LastErrorText)
    Exit Sub
End If


' Login to the source IMAP server
success = imapSrc.Login("admin@chilkatsoft.com","myPassword")
If (success <> True) Then
    Debug.WriteLine(imapSrc.LastErrorText)
    Exit Sub
End If


Dim imapDest As New Chilkat.Imap

' Connect to our destination IMAP server.
success = imapDest.Connect("mail.example-code.com")
If (success <> True) Then
    Debug.WriteLine(imapDest.LastErrorText)
    Exit Sub
End If


' Login to the destination IMAP server
success = imapDest.Login("myLogin","myPassword")
If (success <> True) Then
    Debug.WriteLine(imapDest.LastErrorText)
    Exit Sub
End If



' Select an IMAP mailbox on the source IMAP server
success = imapSrc.SelectMailbox("Inbox")
If (success <> True) Then
    Debug.WriteLine(imapSrc.LastErrorText)
    Exit Sub
End If


' After selecting a mailbox, the NumMessages property will
' be updated to reflect the total number of emails in the mailbox:
Debug.WriteLine(imapSrc.NumMessages)

' The emails in the mailbox will always have sequence numbers
' ranging from 1 to NumMessages.

' This example will copy the first 10 messages.
' We'll leave it up to you to write code to copy
' the entire sequence range in reasonable size chunks.
Dim startSeqNum As Integer = 1
Dim msgCount As Integer = 10

Dim sa As Chilkat.StringArray
sa = imapSrc.FetchSequenceAsMime(startSeqNum,msgCount)
If (imapSrc.LastMethodSuccess <> True) Then
    Debug.WriteLine(imapSrc.LastErrorText)
    Exit Sub
End If


Dim i As Integer
For i = 0 To sa.Count - 1
    success = imapDest.AppendMime("Inbox",sa.GetString(i))
    If (success <> True) Then
        Debug.WriteLine(imapDest.LastErrorText)
        Exit Sub
    End If

Next


' Disconnect from the IMAP servers.
success = imapSrc.Disconnect()
success = imapDest.Disconnect()