also match the closing paren and update the readme

Author: adminadmin

README.md

@@ -5,7 +5,7 @@ This plugin parses the "Received" header for the last hop and checks if TLS was
 receiving MTA.
 
 In Postfix this can be enabled by
-setting [`smtpd_tls_received_header = yes`](https://www.postfix.org/postconf.5.html#smtpd_tls_received_header). Sendmail
+setting [`smtpd_tls_received_header = yes`](https://www.postfix.org/postconf.5.html#smtpd_tls_received_header). Sendmail and Stalwart
 should work out of the box. Other MTAs have not been explicitly tested.
 
 Note that while this talks about "encryption", this does not imply security. An encrypted mail may still be insecure,

tls_icon.php

@@ -2,7 +2,7 @@
 
 class tls_icon extends rcube_plugin
 {
-	const POSTFIX_TLS_REGEX = "/\(using (TLS[^()]+(?:\([^)]+\))?)/im";
+	const POSTFIX_TLS_REGEX = "/\(using (TLS[^()]+(?:\([^)]+\))?)\)/im";
 	const POSTFIX_LOCAL_REGEX = "/\([a-zA-Z]*, from userid [0-9]*\)/im";
 	const SENDMAIL_TLS_REGEX = "/\(version=(TLS.*)\)(\s+for|;)/im";