[root@localhost ~]# exim -bV Exim version 4.91 #2 built 22-Aug-2018 14:16:00 Copyright (c) University of Cambridge, 1995 - 2018 (c) The Exim Maintainers and contributors in ACKNOWLEDGMENTS file, 2007 - 2018 Berkeley DB: Berkeley DB 5.3.21: (May 11, 2012) Support for: crypteq iconv() IPv6 PAM Perl Expand_dlfunc OpenSSL Content_Scanning DKIM DNSSEC Event OCSP PRDR TCP_Fast_Open Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmjz dbmnz dnsdb dsearch ldap ldapdn ldapm nis nis0 nisplus passwd sqlite Authenticators: cram_md5 cyrus_sasl dovecot gsasl plaintext spa tls Routers: accept dnslookup ipliteral manualroute queryprogram redirect Transports: appendfile/maildir/mailstore/mbx autoreply lmtp pipe smtp Malware: f-protd f-prot6d drweb fsecure sophie clamd avast sock cmdline Fixed never_users: 0 Configure owner: 0:0 Size of off_t: 8 Configuration file is /etc/exim/exim.conf