Anyone else seeing this repeatedly in the SMTP Log after upgrading to OS X 10.11.4 and OS X Server 5.1?
Mar 22 08:23:57 postfix/smtpd: warning: run-time library vs. compile-time header version mismatch: OpenSSL 2.0.0 may not be compatible with OpenSSL 0.9.8
Mar 22 08:23:57 postfix/smtpd: warning: run-time library vs. compile-time header version mismatch: OpenSSL 2.0.0 may not be compatible with OpenSSL 0.9.8