I am in a process of configuring macros and queues for pmta, and have developed few questions. Will appreciate any input. Yahoo.com mx record resolves to such mtas: mta5.am0.yahoodns.net mta6.am0.yahoodns.net mta7.am0.yahoodns.net Yahoo.co.uk resolves to only one mta: mx-eu.mail.am0.yahoodns.net Each one of those mtas has multiple IPs. Do connection limits per my ip, emails per minute allowed etc apply to each yahoo's ip address, to each mta maybe separately, or to all of them globally at once? Can there be different limits at the same time on any of those? Say my ip based on it's reputation can send 20 emails per minute. Does this apply to one yahoo's mta and I can send 20/m to each or only 20/m to all of them? Is there any difference when it comes to their American and European mtas in terms of throttling and syncing between them? How does it compare to other esps (AOL, gmail, etc)? Any input would be welcome.