I have a strange problem. I'm on Debian 7 with Ispconfig 3.1.6 I can send email, but I have problems with receiving from external network, for example gmail.com. I have at least one domain, which can't receive email. For example: I have a domain ymakkonen.fi, which can send and receive, but domain: toivalanurheilijat.fi can only send and receive from internal network. When I try to send email from gmail for example to email@example.com, nothing happens. I have double checked my dns settings.