A blank screen usually means that Postfix is waiting for something. In the end, it will show a prompt, but that could take minutes, which is too long for many MTA's to actually deliver mail. Most of the time it's DNS, that Postfix is waiting for. On the host, try "host some.remote.host" or "nslookup some.remote.host". If that times out, too... Look at your firewall for outgoing DNS settings.
Also, the /var/log/mail.log or /var/log/maillog (depending on your OS) could show some hints...
Best regards,
Menno Pieters |