in fact some of them were inherited from earlier versions.
-----------------------------------------------------------------------------------------
-accept_8bitmime boolean false main 1.60
+accept_8bitmime boolean true main 1.60 changed to true in 4.78
acl_not_smtp string* unset main 4.11
acl_not_smtp_mime string* unset main 4.51 with content scan
acl_smtp_auth string* unset main 4.00
gecos_pattern string unset main
gethostbyname boolean false smtp
gnutls_compat_mode boolean unset main 4.70
-gnutls_require_kx string* unset main 4.67
- string* unset smtp 4.67
-gnutls_require_mac string* unset main 4.67
- string* unset smtp 4.67
-gnutls_require_protocols string* unset main 4.67
- string* unset smtp 4.67
+gnutls_require_kx string* unset main 4.67 deprecated, warns
+ string* unset smtp 4.67 deprecated, warns
+gnutls_require_mac string* unset main 4.67 deprecated, warns
+ string* unset smtp 4.67 deprecated, warns
+gnutls_require_protocols string* unset main 4.67 deprecated, warns
+ string* unset smtp 4.67 deprecated, warns
group string + routers 4.00
unset transports 4.00 replaces local option in some transports
header_line_maxsize integer 0 (unset) main 4.14
tls_remember_emstp boolean false main 4.21
tls_require_ciphers string* unset smtp 4.00 replaces tls_verify_ciphers
string* unset main 4.33
+tls_sni string* unset main 4.78
tls_tempfail_tryclear boolean true smtp 4.05
tls_try_verify_hosts host list unset main 4.00
tls_verify_certificates string* unset main 3.20
-bV Verify version number
-bv Test recipient address verification
-bvs Test sender address verification
+-bw + Inetd wait mode
-C + Use alternate configuration file
-D + Define macro for configuration file
-d + Turn on debugging output
MSGLOG_DIRECTORY_MODE optional* mode for message log directory
MV_COMMAND system path to mv command
NO_SYMLINK optional install doesn't make 'exim" symlink
-PCRE_CFLAGS system compile flags for PCRE library
+PCRE_CONFIG system* use pcre-config for PCRE support
+PCRE_LIBS system* library for using PCRE
PERL_CC system* compiler for Perl interface code
PERL_CCOPTS system* flags for same
PERL_COMMAND system path to Perl