Not sure if it is related, but my /var/spool/exim/scan and /var/spool/exim/input directories have a lot of files in them. Input: 2223 files Scan: 2223 files I am sure it is not a coincidence. The queue is empty. The files names definitely seem to correspond between the two directories. All the files in inpur are -D files (I believe that means body, -H is header). Interestingly there are n o corresponding -H header files in input. I was notified of this issue by a client who has not received any emails from the below mentioned mx.sendinghost.com [xxx.xxx.xxx.xxx]. They do get a reject message on their end of: Generating server: mx.sendinghost.com client(a)hisdomain.com #< #4.4.2 X-Proprietary; lost connection with my.host.com [xxx.xxx.xxx.xxx] while sending end of data -- message may be sent more than once> #SMTP# I did run a: exim -bh xxx.xxx.xxx.xxx and it ends up at an ACCEPT. From: Helmut Fritz [mailto:helmut(a)fritz.us.com] Sent: Monday, July 11, 2016 12:48 PM To: 'Exim4U General Discussion' Subject: help with DEFER errors Guys, 1. I have a lot of these type of messages in my mainlog: H=(mx.sendinghost.com) [xxx.xxx.xxx.xxx] Warning: ACL "warn" statement skipped: condition test deferred: failed to expand ACL string "${lookup dnsdb{a=$smtp_active_hostname}}": lookup of "a=my.host.com" gave DEFER: I am trying to look through the configs to see if I can determine where and why I am getting these. Are they a cause for any real concer? What causes them and can it be recified? I am not running a multi-ip host, but do host multiple virtual domains. 2. I am not sure if it is related (I think not), but I also get messages that correspond with the sending host that is in some of the above messages but the emails do NOT seem to come through to the users mailbox. I (think I) do see the actual emails in the /var/spool/exim/scan directory though. The only thing I find in the logs is this message: 1b4BZC-0005p9-Ek H= mx.sendinghost.com [xxx.xxx.xxx.xxx] Warning: spam-score-int: 1 (/). spamreject: 990. Any help, ideas or thoughts would be welcome. I did a google search that did not seem to provide an useful help. Thx. Helmut P.S. not yet updated to latest release of exim4u.