Mac Mini, 10.13 High Sierra running Mac Server 5.4. From a Mac client, specifying "Use TLS/SSL" in SMTP settings works just fine when sending out mail. However, from Windows 10 Mail running on a PC in the same network, I cannot keep "Require SSL for outgoing email" checked in the Win10 Mail settings; doing so results in the following error message in the Mac Server's mail log:
2017-11-10 12:38:28.755534-0500 0x39f75 Default 0x0 13873 smtpd: warning: TLS library problem: error:1408A10B:SSL routines:SSL3_GET_CLIENT_HELLO:wrong version number:/BuildRoot/Library/Caches/com.apple.xbs/Sources/libressl/libressl-22/libressl/ssl/s3_srvr.c:810: I'm pretty much a newbie to Postfix but in reading other posts on this forum, I knew enough to locate the main.cf file on my Mac Server. I *think* the portion seen below is the relevant section of that file that might be involved in this issue; if not, I'd appreciate any advice. Thanks! smtp_tls_protocols = !SSLv2 smtp_tls_mandatory_protocols = !SSLv2 smtpd_tls_protocols = !SSLv2 smtpd_tls_mandatory_protocols = !SSLv2 smtp_tls_loglevel = 1 smtp_tls_security_level = may -- Sent from: http://postfix.1071664.n5.nabble.com/Postfix-Users-f2.html
