Send email with SendGrid from Go (sendgrid-go v3)

1. Install: go get github.com/sendgrid/sendgrid-go.
2. Build and send:

import ( "fmt" "log" "os" "github.com/sendgrid/sendgrid-go" "github.com/sendgrid/sendgrid-go/helpers/mail" )

from := mail.NewEmail("Your Name", "[YOURVERIFIEDSENDER]") // verified sender to := mail.NewEmail("Their Name", "[RECIPIENTEMAIL]") message := mail.NewSingleEmail(from, "subject here", to, "plain body", "[strong]html body[/strong]") client := sendgrid.NewSendClient(os.Getenv("SENDGRIDAPI_KEY")) response, err := client.Send(message) if err != nil { log.Println(err) } else { fmt.Println(response.StatusCode) // 202 means accepted fmt.Println(response.Headers) }

3. NewSingleEmail takes from, subject, to, plain text, html. For multi-recipient or per-recipient data, build the v3 JSON with the mail helpers instead.
4. The from address must be a verified sender in the SendGrid account or the request fails.
5. Keep SENDGRIDAPIKEY in the environment. Do not hardcode it, and do not print the client config in logs.

The official Go quickstart: go get github.com/sendgrid/sendgrid-go, mail.NewSingleEmail for the message, sendgrid.NewSendClient(os.Getenv(...)) for the client, and client.Send returning a response with StatusCode. Sources: https://github.com/sendgrid/docs/blob/develop/content/docs/for-developers/sending-email/quickstart-go.md | https://github.com/sendgrid/sendgrid-go | https://docs.sendgrid.com/api-reference/mail-send/mail-send