You can use the command exim -bV to test the current configuration of Exim
[callisto] (~) >>> exim -bV
Exim version 4.82 #2 built 06-Feb-2014 16:42:28
Copyright (c) University of Cambridge, 1995 - 2013
(c) The Exim Maintainers and contributors in ACKNOWLEDGMENTS file, 2007 - 2013
Berkeley DB: Berkeley DB 4.7.25: (September 12, 2013)
Support for: crypteq iconv() IPv6 PAM Perl OpenSSL Content_Scanning DKIM Old_Demime Experimental_SPF Experimental_SRS
Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch dbm dbmjz dbmnz passwd
Authenticators: cram_md5 dovecot plaintext spa
Routers: accept dnslookup ipliteral manualroute queryprogram redirect
Transports: appendfile/maildir autoreply pipe smtp
Size of off_t: 8
Configuration file is /etc/exim.conf