Hi group, Thank you for all your suggestions and even config-files! It looks like I'm able to go without my ISP's smart host. I was able to telnet into ursine 25, although it knocks on my firewall port 113 (auth). Why is it doing that? Right now, my firewall blocks this port and it reeeeeally slows down transaction. But, what's all that about DUL and things like that? Why is there something like a smart host? Regards, David