mail { auth_http 127.0.0.1/php/proxy.php ; proxy on; proxy_pass_error_message on; ssl_certificate /etc/pki/tls/certs/startssl.crt; ssl_certificate_key /etc/pki/tls/certs/startssl.key; ssl_protocols TLSv1 TLSv1.1 TLSv1.2; ssl_session_cache shared:MAIL:10m; smtp_capabilities PIPELINING 8BITMIME "SIZE 20480000"; pop3_capabilities TOP USER UIDL; imap_capabilities IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFER