Article 166690 of comp.os.vms:
Aaron Leonard wrote:
> 
> James Wilkinson <wilkinson@hsq.com> writes:
> |Anyone know what this logical does?  Reason I ask is when
> |specifying the address username@host in VMS V7.1 MAIL I don't
> |want the address to be rewritten to host::username.  For
> |example, if I use transport%"username@host" the address is
> |not rewritten.  UCX V4.1 POP clients are much happier without
> |the DECnet rewrite.
> 
> If your Internet mail transport is SMTP% (as would be the case
> with the UCX and MultiNet mailers), then
> $ DEFINE/SYSTEM/EXEC MAIL$INTERNET_MODE SMTP
> will give you what you want - it will cause mail addressed
> to: user@host
> to go to SMTP%"user@host".

Thanks Aaron.  I am using MX and the following has the desired
effect.  Seems the MODE logical is SMTP regardless of transport.

$ define/system/exec mail$internet_transport mx
$ define/system/exec mail$internet_mode smtp

James