support, by using OpenSSL or GnuTLS library ones. This means DKIM is
only supported when built with TLS support.
+JH/35 Require SINGLE_DH_USE by default in OpenSSL (main config option
+ openssl_options), for security. OpenSSL forces this from version 1.1.0
+ server-side so match that on older versions.
+
Exim version 4.86
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