Just a non-well-informed thought:
Are you not able to cache the results and combine multiple requests that would
return the same results into a single first call and subsequent requests would
read from the cache? That is to say comparing 50 calls to 300 calls, the
likelihood of more of the
> At this time I see this way:
>
> 1. Use TDNSQuery.MXLookup to resolve MX, then TDNSQuery.ALookup to
> resolve MX's IP. Then supply resolved MX IP to TSmtpCli to avoid
> GetHostByName.
>
> 2. Cache both MX and A results in my own DNS cache.
Seems sensible, just make sure you time out the
