Visual Basic 6.0

MX Lookup Mail Server Domain by Email Address

How to find the mail server for a given email address. Returns the domain name of the primary mail server. Visual Basic 6.0

Dim success As Long
success = 0

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

Dim dns As New ChilkatDns
Dim json As New ChilkatJsonObject

Dim emailAddr As String
emailAddr = "bob@example.com"

' This gets all MX domains for an email address.  (Typically one domain.)
' The preferred domain will be at index 0 (see below).
success = dns.Query("MX",emailAddr,json)
If (success = 0) Then
    Debug.Print dns.LastErrorText
    Exit Sub
End If

Dim i As Long
i = 0
Dim count_i As Long
count_i = json.SizeOfArray("answer.mx")
Do While i < count_i
    json.I = i
    Dim domain As String
    domain = json.StringOf("answer.mx[i].domain")
    Debug.Print domain
    i = i + 1
Loop