How to Send an SMTP Email | Twilio - SendGrid
docs.sendgrid.com › getting-started-smtpThe X-SMTPAPI header is parsed by SendGrid to modify your message in the ways you specify. For a deeper dive into what SMTP is, the benefits of sending an email with SMTP, and how SendGrid can help, see the SMTP Service Crash Course on our blog. Sending a test SMTP email with Telnet. This page will help you send a first test message using Telnet.
Email Delivery Service | SendGrid
https://sendgrid.com/solutions/email-api/smtp-service25.10.2019 · Integrate and deliver in minutes with our RESTful APIs or SMTP relay. Access comprehensive documentation, open source libraries in 7 languages, and a clear setup flow to help you send right away. Integrate with our feature-rich mail/send API. Plug into our SMTP relay for standardized sending. Enrich your SMTP relay sending with our SMTP API.