| Standard ESMTP |  | ESMTP over TLS (port 465) |  | Message Submission Protocol (port 587) | 
      
        | @ENABLED@ Enabled | @ENABLED_SSL@ Enabled | @ENABLED_MSA@ Enabled | 
      
        | @MSGID@ Add default Message-ID: header | @MSGID_SSL@ Add default Message-ID: header | @MSGID_MSA@ Add default Message-ID: header | 
      
        | @DATE@ Add default Date: header | @DATE_SSL@ Add default Date: header | @DATE_MSA@ Add default Date: header | 
      
        | @CHECKDNS@ Lookup return domain in DNS | @CHECKDNS_SSL@ Lookup return domain in DNS | @CHECKDNS_MSA@ Lookup return domain in DNS | 
      
        | @AUTH@ Require authentication | @AUTH_SSL@ Require authentication | @AUTH_MSA@ Require authentication | 
      
        | Max # of connections accepted: |  | Max # of connections accepted: |  | Max # of connections accepted: |  | 
      
        | Max # of connections from one IP address: |  | Max # of connections from one IP address: |  | Max # of connections from one IP address: |  | 
      
        | Max # of connections from one netblock: |  | Max # of connections from one netblock: |  | Max # of connections from one netblock: |  |