Best FREE or cheap email services for custom domain.com

Purelymail is great for $10 a year. It's a one man show, but I had no issues with it so far.

+1 for PurelyMail.

As a non-tech guy living on 3rd world wages, PurelyMail is perhaps the best for me.

I just moved my family to outlook.com, Office 365 Family allows up to 6 people for $99/yr (total), and supports custom domains.

If you have 6 people like I do, that's about $1.38/person/month vs the $6/person/month that GSuite wants.

I use the Zoho $1 plan for one of my domains and have no complaints with it so far.

I use yandex.com with custom domains for a few years. Light use but it does the job.