Email queue system for massive mailing

Question

I am developing email queue module for my php application. So all emails(user notifications, password reminder ...) will be put into the queue and will send by cron process based on the priority of emails. But i will have news letter module soon. so my question is either to keep newsletter in seperated queue or can be used the centralized queue since i have priority attribute for all emails ?

Thanks.

Answer 1

Word of caution: Do you have experience building email senders? It's a hairy adventure and you're almost always better off outsourcing the task. Email deliverability is not easy or predictable.

You can stick with one queue, but be sure to have the ability to specify which IP address a particular email can be sent from. You'll want to have different IP addresses for sending newsletters, signups, invoices, etc. And even further, you'll want to have an IP for sending newsletters to trusted addresses and untrusted addresses.