On 16.5.2012 0.18, John Hinton wrote: > A couple of things to check. I don't know if these servers are in the > same location or not but it is possible if not, that your provider > blocks port 25. Here are two configs to check. Thanks for input. I can make the contact from the backup-mailserver to the primary mailserver manually using telnet (details in previous posts), which proves that 25 is not blocked. BTW, the two servers are virtual machines in one and the same physical box. - Jussi