> > We don't generate bounces to external senders, only local 
> senders, and 
> > we only do that because some MUAs don't cope well with 
> rejections at SMTP time.
> 
> Your ACLs can easily be set to identify MUA traffic from MTA. 
>  Traffic coming from local address space can be presumed to 
> be MUA.  Internal mail servers can be identified by hardcoded 
> list or SMTP AUTH.
> 
> External MUA are identified by SMTP AUTH since that is likely 
> part of your existing anti-relay mechanism.
> 
> Then it is a simple matter of rejecting at SMTP time for MTA 
> and generating bounces for MUA.
> 
> This generally will also reduce the size of your queue runs 
> since you will have far fewer bounce deliveries due to 
> misaddressed spam, etc.
> 

I must be missing your point, because you seem to be describing what we
already do.

- Mark


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