I use Gmail for personal mail and Yandex mail for my domains. I tried SendGrid but when I tested with Gmail, Outlook.com and Yahoo, most mails got into spam folder.

It's best to test when you set up email, whether you use your own server or use a provider.

Most of the times, sending mail from your own server will guarantee your mail gets into spam folder.

I can highly recommend Yandex as a mail provider.