postfix: Perfect Forward Secrecy (PFS)
openssl gendh -out /etc/postfix/pfs_512.pem -2 512 openssl gendh -out /etc/postfix/pfs_1024.pem -2 1024 postconf -e "smtpd_tls_tls_dh1024_param_file=/etc/postfix/pfs_1024.pem" postconf -e "smtpd_tls_dh512_param_file=/etc/postfix/pfs_512.pem" postconf -e "smtpd_tls_eecdh_grade=strong" postconf -e "smtp_tls_loglevel=1" postconf