Hi, i need send 500k emails per week to our customers and i'm searching the better solution, i think i need this features for manage my list and not be a spammer for hotmail, yahoo, etc.
.-Limit the max emails per domain and time (example 1 per 5 minutes)
.-Manage multiple lists
.-email address verified
.-manage bounces (email address not exist, mailbox full, etc) and mark address as bouncer
.-Multi ip for use 2 ip address for less bounce
.-Spf and domainkeys
Other that i don't thinked but will be necessary and How i can setup my spf and request to hotmail, yahoo, aol, etc whitelisting in your servers