[ Tried this over on mailop; no response, so now trying here. ] I've noticed that one of my servers has been unable to establish port 25 connections to hosts such as mx00.emig.gmx.net for over a week...and I'm entirely puzzled as to why, since it only sends a trickle of traffic to a handful of users @gmx.net/@gmx.de etc. (They're on a couple of small, low-volume Mailman-managed lists, and have been for time periods ranging from "over a year" to "most of a decade" without any issues.) Some help figuring out why this is happening would be entirely welcome. Thanks, ---rsk