Okay, My website's user count is going to pass the 1k mark soon, and now I want to start emailing weekly newsletters to everyone (with the option to cancel the subscription + only to the users that checked the box "subscribe me" when joining the site). Just wanted to know, what software do you use for sending bulk emails to your users? Of the (almost) 1k users, about 700 have checked the box they would like to subscribe to the emails, so it shouldn't be any software that will slow down my server and try to send them all at once... There's a million different mailing list managers, I just want some advice from experienced users like yourselves
Safe answer is to use PHPList. It will stagger the emails. Theres a plugin to merge it with Wordpress if you use it. I'm sure other options exist though.
One of my customers is managing 700 subscribers with phplist and she is very happy with it. Script is free, open source, supports batch processing and has many other neat features.