Re: DATA 554 responses - To Retry or Not.

> Glenn Anderson wrote:
>
> > > Suppose your MTA was connecting to our server, and you were sending 
> > > mail to 3 accounts and the RCPT reply codes was:
> > >    RCPT TO: user1 ---> 250
> > >    RCPT TO: user2 ---> 450
> > >    RCPT TO: user3 ---> 550
> > >
> > > because there was at least one 250, you were allowed to go to DATA
Is that "were allowed to" or "SHOULD"? If the quest for optimization 
mentioned earlier in this thread were taken excessively zealously, an 
MTA would think it is a good idea to just QUIT for now, looking 
forward for the odd moment when both user1 and user2 will 
simultaneously get a 250 response.
That crazy idea would rule out the technique to use 450 replies in 
order to avoid receiving data for a set o recipients whose filtering 
options differ. If splitting were not possible, MTAs would be forced 
to send DSNs for spam addressed to multiple users if one of them 
disabled filtering. A somewhat unacceptable requirement.