SMTP providers:
| SERVICE | PRICE |
| ElasticEmail (up to 150K free) | $ - |
| AWS SES | $ 2.50 |
| SendInBlue | $ 7.37 |
| MailGun | $ 7.50 |
| MailJet | $ 8.00 |
| SparkPost | $ 9.00 |
| SendGrid | $ 10.00 |
| SCANMAILX | $ 15.00 |
| Mandrill | $ 20.00 |
| PostMark | $ 37.50 |
| SocketLabs | $ 80.00 |
| -based on 25K emails per month. |