I have been using sendy for an year now. While it does have most of the features one would need, it starts to choke. I have a mailing list with 700k subscribers and it's been a pain to use sendy.
Same here. Can't manage to increase send speed in a significant way. Do you mind sharing what you optimized on your server to be able to send a mailing list to such a big number of subscribers?
I am thinking of using sendy, why is speed an issue? Aren't the emails delivered by SES? Can't you just send to SES a template and a list of emails and let them handle it?