€0,90/month at Zoho for Mail Lite right? How many domains can you setup with that? Their pricing page doesn't mention that https://www.zoho.com/mail/zohomail-pricing.html Other than that, I must say that Zoho is probably the cheapest option out there. I am using it right now (for free) but I can only setup one custom domain. This whole conversation have gotten me quite excited to see how good my ISP is so I have just ordered a RPi to try setup a email server at home (for fun).