P.S. A way to reproduce (not every time, but often): delete all files in /var/spool/exim/db , restart Exim with HUP signal, send a message to @ yahoo.com . After the message is received (with auth) by Exim, while it is waiting in the queue (for unknown reason):
-rw-r----- 1 mailnull mail 16384 Dec 25 18:25 callout -rw-r----- 1 mailnull mail 0 Dec 25 18:25 callout.lockfile -rw-r----- 1 mailnull mail 0 Dec 25 18:25 retry.lockfile -rw-r----- 1 mailnull mail 16384 Dec 25 18:25 wait-throttled_smtp -rw-r----- 1 mailnull mail 0 Dec 25 18:25 wait-throttl~mtp.lockfile root@lena:/root# exim_dumpdb /var/spool/exim wait-throttled_smtp mta6.am0.yahoodns.net 1eTWxP-000Kok-PE mta5.am0.yahoodns.net 1eTWxP-000Kok-PE mta7.am0.yahoodns.net 1eTWxP-000Kok-PE root@lena:/root# exim_dumpdb /var/spool/exim callout 25-Dec-2017 19:54:35 yahoo.com callout=accept postmaster=unknown random=unknown 25-Dec-2017 19:54:35 lena_kiev @ yahoo.com/<Lena @ lena.kiev.ua> callout=accept root@lena:/root# host yahoo.com yahoo.com has address 206.190.39.42 yahoo.com has address 98.139.180.180 yahoo.com has address 98.138.252.38 yahoo.com has IPv6 address 2001:4998:44:204::100d yahoo.com has IPv6 address 2001:4998:c:e33::53 yahoo.com has IPv6 address 2001:4998:58:2201::73 yahoo.com mail is handled by 1 mta5.am0.yahoodns.net. yahoo.com mail is handled by 1 mta6.am0.yahoodns.net. yahoo.com mail is handled by 1 mta7.am0.yahoodns.net. root@lena:/root# exim -bV Exim version 4.90 #0 (FreeBSD 6.3) built 24-Dec-2017 20:40:09 Copyright (c) University of Cambridge, 1995 - 2017 (c) The Exim Maintainers and contributors in ACKNOWLEDGMENTS file, 2007 - 2017 Probably Berkeley DB version 1.8x (native mode) Support for: crypteq iconv() use_setclassresources PAM Expand_dlfunc OpenSSL Content_Scanning DKIM Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch dbm dbmjz dbmnz dnsdb Authenticators: plaintext Routers: accept dnslookup ipliteral manualroute queryprogram redirect Transports: appendfile autoreply pipe smtp Fixed never_users: 0 Configure owner: 0:0 Size of off_t: 8 Configuration file is /usr/local/etc/exim/configure.lena (I inserted blanks around @ in email addresses in order to be readable in mailing list archives). The transport: throttled_smtp: driver = smtp serialize_hosts = * dkim_domain = <redacted> dkim_selector = 3 dkim_private_key = /usr/local/etc/exim/dkim3.key connection_max_messages = 5 max_rcpt = 9 retry_use_local_part hosts_avoid_pipelining = * hosts_try_chunking = -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
