Now I found the reason. The telco (oister.dk) only allow port 25 traffic to one server: smtp.oister.dk. Using this, it works perfect. /Rasser

Region : Denmark Model : TL-MR3420 Hardware Version : V2 Firmware Version : 3.13.27 Build 121206 Rel.60215n I have a TL-MR3420 router placed in a remote location. The internet connection is via 3G,...