> and that seemed to work "warming them up" to the likes of Gmail and yahoo, etc Yes, warming up a "fresh" IP definely works. If you suddenly send thousands of

> and that seemed to work "warming them up" to the likes of Gmail and yahoo, etc Yes, warming up a "fresh" IP definely works. If you suddenly send thousands of mails from a new server - sure, you'll be labeled as Spam. If you slowly increase the volume over time, have a good domain and recipients that interact with the email, things should be fine. GMail has quite helpful guidelines [1]. 1: https://support.google.com/mail/answer/81126?hl=en https://support.google.com/mail/answer/81126?hl=en