Ars Technica

SMTP Protocol Error Occurred

I have some e-mail on my Exchange Queue for 3/4 domains that just won't send. It just says "SMTP Protocol Error Occurred". I activated logging in MSExchangeTransport ...
Ars Technica

My first iptables setup - smtp protocols

4 0 0 ACCEPT tcp -- any any 10.100.100.0/24 anywhere state NEW tcp dpt:ssh 5 1 64 ACCEPT tcp -- any any anywhere anywhere state NEW tcp dpt:smtp 6 730 103K REJECT all -- any any anywhere anywhere ...