Hi all, I recently had to add 8 internet SMTP servers (smtp01.host.com - smtp08.host.com) to my "relay_from_hosts" list in my exim config in order to accommodate email from our hosted web servers. Ever since then, I've been getting numerous errors in the exim_mainlog file -- more than 30,000/day (out of a total of ~220,000 entries/day) -- from one of these hosts (smtp05.host.com).
Here's what one of these entries looks like: 2005-12-21 03:52:02 no IP address found for host smtp05.host.com (during SMTP connection from NULL) But I'm even more puzzled by this: The log occasionally contains the same error with a different twist: … 2005-12-22 07:14:02 no IP address found for host smtp05.host.com (during SMTP connection from (pc-200-74-52-7.megavia.pc.metropolis-inter.com) [200.74.52.7]) 2005-12-22 07:17:52 no IP address found for host smtp05.host.com (during SMTP connection from (ourdomain.com) [24.63.139.240]) 2005-12-22 07:17:52 no IP address found for host smtp05.host.com (during SMTP connection from (ourdomain.com) [24.63.139.240]) 2005-12-22 07:17:53 no IP address found for host smtp05.host.com (during SMTP connection from (ourdomain.com) [24.63.139.240]) 2005-12-22 07:24:19 no IP address found for host smtp05.host.com (during SMTP connection from (a-iqtw7xc0af1mj) [222.35.79.177]) 2005-12-22 07:31:03 no IP address found for host smtp05.dc2.safesecureweb.com (during SMTP connection from (ctx.ourdomain.com) [192.168.2.204]) … These "abnormal" entries occur less ~300 times per day, but often have various IP addresses and "hostnames". The most common IP (24.63.139.240) from today's log resolves to what appears to be a DHCP-assigned address: … ;; ANSWER SECTION: 240.139.63.24.in-addr.arpa. 1D IN PTR c-24-63-139-240.hsd1.nh.comcast.net. … What does all this mean? I'm concerned that we've opened a hole that we shouldn't have. Any help/info would be appreciated. Here's my exim version info (running on Solaris 9): $ exim -bV Exim version 4.30 #6 built 08-Feb-2004 22:32:43 Copyright (c) University of Cambridge 2003 Probably ndbm Support for: iconv() Lookups: lsearch wildlsearch nwildlsearch dbm dmbnz Authenticators: Routers: accept dnslookup ipliteral manualroute queryprogram redirect Transports: appendfile autoreply pipe smtp Fixed never_users: 0 Configuration file is /opt/exim/etc/configure Regards, Bill
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