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http://bugs.exim.org/show_bug.cgi?id=1386 Todd Lyons <[email protected]> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |[email protected] Status|NEW |RESOLVED Resolution| |INVALID --- Comment #1 from Todd Lyons <[email protected]> 2013-09-21 16:33:34 --- You almost certainly are sending to a site and pMTUD (path MTU Discover) is broken between the two of you. Typically this means that one or the other side is blocking all ICMP instead of just the few types of ICMP that are bad or leak information. Less typical (never in my experience) is that it's somewhere in-between. It has always been a firewall on one end or the other. Fortunately for you, *nix provides a simple tool which can discover the MTU of a path, but only if ICMP is functioning properly from end to end. tracepath -n tar.get.ip.address Go to http://packetlife.net/blog/2008/aug/18/path-mtu-discovery/ for more info, which shows a sample session where it starts at the system default (1500) and then "discovers" the maximum packet size that can be passed. You can also have a remote site do pMTU testing for both you and the place you are trying to send to: http://wand.net.nz/pmtud/ Sometimes, third party views of the situation will do more to tell you what is going on than you testing from your site. In the end, this is not an exim problem, but a networking problem. Exim properly detected that it did not receive the 250 OK from the remote site. Whether this is due to the ICMP packet coming back from that remote site to indicate reduced MTU getting dropped (most likely by your firewall), or if it's due to the remote side simply hanging and never responding, either way, Exim timed out and closed things down on your side, and queued the message for retry later. -- Configure bugmail: http://bugs.exim.org/userprefs.cgi?tab=email -- ## List details at https://lists.exim.org/mailman/listinfo/exim-dev Exim details at http://www.exim.org/ ##
