Over the last couple of weeks, we have begun receiving a *small* number of bounces like Received: from PSUVM (NJE origin LST2SMTP@PSUVM) by PSUVM.PSU.EDU (LMail V1.2c/1.8c) with BSMTP id 1036; Fri, 9 Oct 1998 17:42:19 -0400 Date: Fri, 09 Oct 98 17:42:15 EDT From: <[log in to unmask]> To: <[log in to unmask]> Subject: Undeliverable Mail LISTS.PSU.EDU unable to deliver following mail to recipient(s): <[log in to unmask]> LISTS.PSU.EDU unable to connect for 3 days to recipient host. to [log in to unmask] Since we distribute lots of mail from various lists to those addresses (and sometimes our backlog is signficant), and my best analysis using SMTP QUEU commands (this is VM/CMS), PING (small and LARGE packets), SMTP dialogues (full RFC821+822) reveal no problem, I wonder if their various MX servers are throttling or out of steam? I don't think it is an IP-address caching problem. I've been in contact with MSN.COM support personnel but have gotten no where, fast.