Clarify tls:// and ssl:// settings for connecting to SMTP server

config/config.inc.php.sample

@@ -40,8 +40,8 @@ $config['db_dsnw'] = 'mysql://roundcube:pass@localhost/roundcubemail';
 $config['default_host'] = 'localhost';
 
 // SMTP server host (for sending mails).
-// To use SSL/TLS connection, enter hostname with prefix ssl:// or tls://
+// Enter hostname with prefix tls:// to use STARTTLS, or use
-// Supported replacement variables:
+// prefix ssl:// to use the deprecated SSL over SMTP (aka SMTPS)
 // %h - user's IMAP hostname
 // %n - hostname ($_SERVER['SERVER_NAME'])
 // %t - hostname without the first part

config/defaults.inc.php

@@ -239,7 +239,8 @@ $config['messages_cache_threshold'] = 50;
 // ----------------------------------
 
 // SMTP server host (for sending mails).
-// To use SSL/TLS connection, enter hostname with prefix ssl:// or tls://
+// Enter hostname with prefix tls:// to use STARTTLS, or use
+// prefix ssl:// to use the deprecated SSL over SMTP (aka SMTPS)
 // Supported replacement variables:
 // %h - user's IMAP hostname
 // %n - hostname ($_SERVER['SERVER_NAME'])