Postfix的3个配置

去掉vrfy返回

disable_vrfy_command = yes

       disable_vrfy_command (no)
              Disable the SMTP VRFY command.

 

关闭ip反向查找域名，减少dns搜索，提升响应速度

smtpd_peername_lookup = no

       smtpd_peername_lookup (yes)

              Attempt  to  look up the remote SMTP client hostname, and verify
              that the name matches the client IP address.

       The per SMTP client connection count and request rate limits are imple-
       mented  in co-operation with the anvil(8) service, and are available in
       Postfix version 2.2 and later.

 

smtpd_discard_ehlo_keywords = dsn, etrn, PIPELINING, silent-discard

A case insensitive list of EHLO keywords (pipelining, starttls, auth, etc.) 
that the SMTP server will not send in the EHLO response to a remote SMTP client.