What are the recommendations for CHGSMTPA?

What are the recommendations for: 
 
Change SMTP Attributes (CHGSMTPA) 
 
on an iSeries that is: 
- sending email out with SNDDST and the QTmmSendMail api 
- sending/receiving email with Domino 
- sending/receiving messages via SNADS SNDNETMSG 
- shouldn't be receiving any smtp email except via Domino 

We want to make sure that when Domino is down and not controlling the smtp 
port we do not become an open relay.
(It's amazing how much stuff is in there that we're going to have to wait 
for Domino R6 for.)
 
Our current settings are: 
 
Autostart server . . . . . . . .   *YES 
Retries by minute: 
  Number of retries  . . . . . .   3 
  Time interval  . . . . . . . .   30 
Retries by day: 
  Number of retries  . . . . . .   0 
  Time interval  . . . . . . . .   0 
Retries by hour: 
  Number of retries  . . . . . .   0 
  Time interval  . . . . . . . .   0 
Retry remote name server . . . .   *NO 
Automatic registration . . . . .   *NO 
  User ID prefix . . . . . . . .   QSM 
  Address  . . . . . . . . . . .   QSMRMTAD 
  System name  . . . . . . . . .   TCPIP 
  Alias table type . . . . . . .   *SYSTEM 
User ID delimiter  . . . . . . .   '?' 
Mail router  . . . . . . . . . .   *NONE 
Coded character set identifier     00819 
Mapping tables: 
  Outgoing EBCDIC/ASCII table  .   *CCSID 
    Library  . . . . . . . . . . 
  Incoming ASCII/EBCDIC table  .   *CCSID 
    Library  . . . . . . . . . . 
Firewall . . . . . . . . . . . .   *NO 
Journal  . . . . . . . . . . . .   *NO 
Process all mail through MSF . .   *NO 
Percent routing character  . . .   *YES 
Dial-up scheduler: 
  Start with SMTP server . . . .   *NO 
  Configuration profile  . . . . 
  Connection time interval . . . 
Support ETRN for server  . . . .   *NO 
Support ETRN for client: 
  Enable client ETRN . . . . . .   *NO 
  Incoming mail server address 
  Mail domain name . . . . . . . 
Support 8-bit MIME . . . . . . .   *NO 
Delivery status notification: 
  Responsible person . . . . . .   *NONE 
Subsystem description  . . . . .   QSYSWRK 
  Library  . . . . . . . . . . .     QSYS 
Realtime Blackhole List  . . . .   *NONE 
Allow relayed mail . . . . . . .   *ALL 
Interface/domain association . .   *NONE 
Filter mail for virus  . . . . .   *NONE 

Rob Berendt
-- 
"They that can give up essential liberty to obtain a little temporary 
safety deserve neither liberty nor safety." 
Benjamin Franklin