I use both MailPoet and Amazon SES to send emails. MailPoet says it's sending service can send up to 50K emails an hour but with the opaque SPAM complaint issue, I frequently have to switch to Amazon to complete my sends. But, when I switch to Amazon, the number of emails I can send per hour drops dramatically event though I have higher limits. MailPoet seems to slow down the number of emails it can process, and I'd like to see the limits lifted.