[Postfix] Remove pipeling from ehlo keywords as we block it in data restrictions

data/conf/postfix/main.cf

@@ -160,7 +160,8 @@ transport_maps = pcre:/opt/postfix/conf/custom_transport.pcre,
   proxy:mysql:/opt/postfix/conf/sql/mysql_relay_ne.cf,
   proxy:mysql:/opt/postfix/conf/sql/mysql_transport_maps.cf
 smtp_sasl_auth_soft_bounce = no
-postscreen_discard_ehlo_keywords = silent-discard, dsn
+postscreen_discard_ehlo_keywords = silent-discard, dsn, pipelining, chunking
+smtpd_discard_ehlo_keywords = pipelining, chunking
 compatibility_level = 2
 smtputf8_enable = no
 # Define protocols for SMTPS and submission service