Was. Now it's mostly Gmail, and even if you do run your own SMTP server, you're still dancing to Google's tune or else your mail lands marked as spam for many (

Was. Now it's mostly Gmail, and even if you do run your own SMTP server, you're still dancing to Google's tune or else your mail lands marked as spam for many (most?) of your recipients, and even then you don't have any guarantee and you don't have diagnostic tools why Gmail acts on your mail as it does.