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I try both software above and here is some of my thought.

Ultramailer
Pros: able to verify the email before send, not valid email or unable to verify email will not send out
Cons: unable to set the number of email for each SMTP server. Example mandrill only accept 600 email per day or 2000/month, the software can simply send more then 2000 on mandrill in one single campaign without able to limit it.

Atomic Mail Sender
Pros: able to set the number of email for each SMTP server.
Cons: Not able to verify the email before send, all email will send out. I believe it will hurt the SMTP server and get banned faster.

Any one had better software to introduce with both pros above?

"Pros: able to verify the email before send, not valid email or unable to verify email will not send out"



you do know that for a server to verify an email it pings or most likely send a message to the email and wait for the ping return or any kind of autoreply from the email right?

the best thing to do is get 2 server
server1 send everything and clean for hardbounces
now that your emails have been cleaned use server2
to send out your campaign

You've said it all @Anniedavis. OP or you use an email verifier service before you send out your emails.