I got about 2000 clients on my website that have subscribed to our mailing list. I've used in the past Swift Mailer but it didn't work the way it was supposed to.
I'm wondering if there is a way that Postfix could keep emails on the mailq (if lots of emails are sent at the same time) and send chunks of 20-30 emails every 10-20 mins. So this way, our server is not blacklisted.
Any suggestions will be appreciate it.