If you use WordPress on Siteground hosting, I’d consider trying The Newsletter Plugin (premium version with Add-ons).  Setup a Subdomain called updates.yourwebsite.com or newsletter.yourwebsite.com and send responsive newsletters right from your WordPress Dashboard for free.  And since you’re using Siteground, you never have to worry about your Ip address getting ruined because they always rotate 1000 Ips and change out the bad ones regularly.  You also don’t have to worry about warming up your Ip address because Siteground has already done it for you.  Plus, if you send from a subdomain, your main domain reputation is protected.  Siteground gives you free email accounts when you host with them, and The Newsletter Plugin is less than a few hundred bucks.  Well worth it.