Christoph Petersen: > Hi Wietse, > > Thanks for the reply. Is there a way to query DNS if the specified MX is > present so I do not have to maintain the list of allowed domains?
I send lots of spam, and I configure DNS such that the sender domain of my spam resolves to your MX (*). Would you please receive millions non-deliverable mail notifications for me? Thanks for helping out. Wietse (*) I'll be happy to provide a bogus primary MX address that never responds.