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.
+
+JH/36 Fix a longstanding bug in memory use by the ${run } expansion: A fresh
+ allocation for $value could be released as the expansion processing
+ concluded, but leaving the global pointer active for it. Possibly
+ involved in Bug 1778.
+
Exim version 4.86
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